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AN-E-2266A
APPLICATION NOTE
VACUUM FLUORESCENT DISPLAY MODULE CHARACTER DISPLAY MODULE
M204SD02AJ
GENERAL DESCRIPTION Futaba Vacuum Fluorescent Display Module M204SD02AJ, with Futaba VFD 204-SD-02GN display, produces 20 digitsx4rows with 5x8 dot matrix. Consisting of a VFD, one chip controller, DC-DC/AC converter, the module can be operated by a parallel interface or a synchronous serial interface, and only 5 voltage power source is required to operate the module.
! Important Safety Notice
Please read this note carefully before using the product.
Warning
* The module should be disconnected from the power supply before handling. * The power supply should be switched off before connecting or disconnecting the power or interface cables. * The module contains electronic components that generate high voltages which may cause an electrical shock when touched. * Do not touch the electronic components of the module with any metal objects. * The VFD used on the module is made of glass and should be handled with care. When handling the VFD, it is recommended that cotton gloves be used. * The module is equipped with a circuit protection fuse. * Under no circumstances should the module be modified or repaired. Any unauthorized modifications or repairs will invalidate the product warranty. * The module should be abolished as the factory waste.
AN-E-2266A [Important Safety Notice]
CONTENTS PAGE 1 1. FEATURES 2. SPECIFICATIONS 1 2-1. GENERAL SPECIFICATIONS 1 2-2. ENVIRONMENTAL SPECIFICATIONS 2 2-3. ABSOLUTE MAXIMUM SPECIFICATIONS 2 2-4. DC ELECTRICAL SPECIFICATIONS 2 2-5. AC ELECTRICAL SPECIFICATIONS 2 2-5-1. MOTOROLA M68-TYPE PARALLEL INTERFACE TIMING 4 2-5-2. INTEL I80-TYPE PARALLEL INTERFACE TIMING 5 2-5-3. SYNCHRONOUS SERIAL INTERFACE TIMING 7 2-5-4. RESET TIMING 3. MODE OF OPERATION 3-1. PARALLEL INTERFACE MODES 7 7 3-1-1. MOTOROLA M68-TYPE MODE 8 3-1-2. INTEL I80-TYPE MODE 8 3-2. SYNCHRONOUS SERIAL INTERFACE MODE 9 3-3. RESET MODE 4. FUNCTIONAL DESCRIPTION 4-1. ADDRESS COUNTER (AC) 10 4-2. DISPLAY DATA RAM (DDRAM) 10 4-3. CHARACTER GENERATOR RAM (CGRAM) 11 4-4. INSTRUCTIONS 11 4-4-1. CLEAR DISPLAY 12 4-4-2. CURSOR HOME 12 4-4-3. ENTRY MODE SET 12 4-4-4. DISPLAY ON/OFF CONTROL 13 4-4-5. CURSOR/DISPLAY SHIFT 13 4-4-6. FUNCTION SET 14 4-4-7. CGRAM ADDRESS SET 14 4-4-8. DDRAM ADDRESS SET 14 4-4-9. ADDRESS COUNTER READ 14 4-4-10. DDRAM OR CGRAM WRITE 15 4-4-11. DDRAM OR CGRAM READ 15 4-5. RESET CONDITIONS 15 5. CONNECTOR INTERFACE 16 6. JUMPER SETTING 16 7. CIRCUIT BLOCK DIAGRAM 16 FIGURE-1 MECHANICAL DRAWING 17 FIGURE-2 CHARACTER FONT TABLE 18 8. WARRANTY 19 9. OPERATING RECOMMENDATION 19
AN-E-2266A [CONTENTS]
1. FEATURE This vacuum fluorescent display (VFD) module consists of a 20 character by 4 line 5x8 dot matrix display, DC-DC/AC converter, and controller/driver circuitry. The module can be configured for a Motorola M68-type parallel interface, an Intel I80-type parallel interface, or a synchronous serial interface. A character generator ROM with 240 5x8 characters is provided along with RAM for the user to program an additional 8 characters. The luminance level of the VFD can be varied by setting two bits in the function set instruction. Two hundred and forty character fonts consisting of a alphabets, numerals and other symbols can be displayed. This module has a dual-port RAM that allows data and instructions to be sent to the module continuously. Thus, the busy flag is always 0 and the host never has to read the busy flag bit to determine if the module is busy. Due to this feature, the execution times for each instruction are not specified. 2. SPECIFICATIONS 2-1. GENERAL SPECIFICATIONS Table-1 Item Number of characters Character configuration Character Height Character Width Character Pitch Line Pitch Dot Size Dot Pitch Peak Wavelength of Illumination Luminance Value 20 characters x 4 lines 5x8 dot matrix 4.84 mm 2.35 mm 3.75 mm 8.71mm 0.39 x 0.517mm 0.49 x 0.618m Green (p=505nm) x=0.235, y=0.405 Minimum 350 cd/m2 Typical 500 cd/m2
2-2. ENVIRONMENTAL SPECIFICATIONS Item Operating Temperature Storage Temperature Operating Humidity Storage Humidity Vibration Symbol Topr Tstg Hopr Hstg - Min. -40 -55 20 20 - Max. +85 +85 85 90 4 Table-2 Unit Comment C C %RH Without condensation %RH Without condensation Total amplitude: 1.5mm Freq: 10-55 Hz sine wave G Sweep time: 1 min./cycle Duration: 2hrs./axis (X,Y,Z) Duration: 11ms G Wave form: half sine wave 3 times/axis (X,Y,Z,-X,-Y,-Z)
Shock
-
-
40
AN-E-2266A [1/19]
2-3. ABSOLUTE MAXIMUM SPECIFICATIONS Item Supply Voltage Input signal Voltage Symbol Vcc VIN Min. -0.3 -0.3 Max. 6.5 Vcc+0.3 Table-3 Unit V V
2-4. DC ELECTRICAL SPECIFICATIONS Item Supply Voltage Supply Current Power Consumption High - Level Input Voltage(see Note) Low - Level Input Voltage High - Level Output Voltage (IOH = -0.1mA) Low - Level Output Voltage (IOL = 0.1mA) Input Current (see Note) Symbol Vcc Icc - VIH VIL VOH VOL II Min. 4.5 - - 0.7Vcc 0 Vcc-0.5 - -500 Typ. 5.0 300 1.5 - - - - - Max. 5.5 400 2.2 Vcc 0.2Vcc - 0.5 1.0 Table-4 Unit V mA W V V V V A
Note: A 10K ohm pull-up resistor is provided on each input line.
2-5. AC ELECTRICAL SPECIFICATIONS 2-5-1. MOTOROLA M68-TYPE PARALLEL INTERFACE TIMING (See Fig. 1 and 2) Item RS, R/W Setup Time RS, R/W Hold Time Input Signal rise Time Input Signal Fall Time Enable Pulse Width High Enable Pulse Width Low Write Data Setup Time Write Data Hold Time Enable Cycle Time Read Data Delay Time Read Data Hold Time Symbol tAS tAH tr tf PWEH PWEL tDS tDH tCYCLE tDD tDHR Min. 20 10 - - 230 230 80 10 500 - 5 Max. - - 15 15 - - - - - 160 - Table-5 Unit ns ns ns ns ns ns ns ns ns ns ns
Note: All timing is specified using 20% and 80% of Vcc as the reference points.
AN-E-2266A [2/19]
RS
tAS
tAH
R/W
tr tf
PWEH
E
tDS PWEL tDH
DB0-DB7
tCYCLE
Fig. 1. Motorola M68-Type Parallel Interface Write Cycle Timing
RS
tAS
tAH
R/W
tr tf
PWEH
E
PWEL tDD tDHR
DB0-DB7
tCYCLE
Fig. 2. Motorola M68-Type Parallel Interface Read Cycle Timing
AN-E-2266A [3/19]
2-5-2. INTEL I80-TYPE PARALLEL INTERFACE TIMING (See Fig. 3 and 4) Item RS Setup Time RS Hold Time Input Signal Fall Time Input Signal Rise Time WR/ Pulse Width Low WR/ Pulse Width High Write Data Setup Time Write Data Hold Time WR/ Cycle Time RD/Cycle Time RD/ Pulse Width Low RD/ Pulse Width High Read Data Delay Time Read Data Hold Time Symbol tRSS tRSH tf tr tWRL tWRH tDSi tDHi tCYCWR tCYCRD tRDL tRDH tDDi tDHRi Min. 10 10 - - 30 100 30 10 166 166 70 70 - 5 Max. - - 15 15 - - - - - - - - 70 50 Table-6 Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Note: All timing is specified using 20% and 80% of Vcc as the reference points.
RS
tRSS tf tr tRSH tWRH
WR/
tWRL tDSi tDHi
DB0-DB7
tCYCWR
Fig. 3. Intel I80-Type Parallel Interface Write Cycle Timing
AN-E-2266A [4/19]
RS
tRSS tf tr tRSH tRDH
RD/
tRDL tDDi tDHRi
DB0-DB7
tCYCRD
Fig. 4. Intel I80-Type Parallel Interface Read Cycle Timing
2-5-3. SYNCHRONOUS SERIAL INTERFACE TIMING (See Fig. 5, 6, 10, and 11) Item STB Setup Time STB Hold Time Input Signal Fall Time Input Signal Rise Time STB Pulse Width High SCK Pulse Width High SCK Pulse Width Low SI Data Setup Time SI Data Hold Time SCK Cycle Time SCK Wait Time Between Bytes SO Data Delay Time SO Data Hold Time Symbol tSTBS tSTBH tf tr tWSTB tSCKH tSCKL tDSs tDHs tCYCSCK tWAIT tDDs tDHRs Min. 100 500 - - 500 200 200 100 100 500 1 - 5 Max. - - 15 15 - - - - - - - 150 - Table-7 Unit ns ns ns ns ns ns ns ns ns ns us ns ns
Note: All timing is specified using 20% and 80% of Vcc as the reference points.
AN-E-2266A [5/19]
tWSTB
STB
tSTBS tCYCSCK tSCKH tSTBH
SCK
tf tSCKL tDSs tDHs tr
SI/SO
Fig. 5. Synchronous Serial Interface Write Cycle Timing
tWSTB
STB
tSTBS tCYCSCK tSCKH tSTBH
SCK
tf tSCKL tDDs tDHs tr
SI/SO
Fig. 6. Synchronous Serial Interface Read Cycle Timing
AN-E-2266A [6/19]
2-5-4. RESET TIMING (See Fig. 7) Item Symbol Delay Time for internal reset at power-up tRSTD Vcc Off Time tOFF Vcc
0.2V tOFF tRSTD 4.5V
Min. 100 1
Max. - -
Table-8 Unit ms ms
STB Fig. 7. Power-Up Internal Reset Timing 3. MODE OF OPERATION The following modes of operation are selectable via jumpers (see section 6. jumper Settings). 3-1. PARALLEL INTERFACE MODES In the parallel interface mode, 8-bit instructions and data are sent between the host and the module using either 4-bit nibbles or 8-bit bytes. Nibbles are transmitted high nibble first on DB4-DB7 (DB0-DB3 are ignored) whereas bytes are transmitted on DB0-DB7. The Register Select (RS) control signal is used to identify DB0-DB7 as an instruction (low) or data (high). 3-1-1. MOTOROLA M68-TYPE MODE This mode uses the Read/Write (R/W) and Enable (E) control signals to transfer information. Instructions/data are written to the module on the falling edge of E when R/W is low and are read from the module after the rising edge of E when R/W is high. RS
R/W
E
DB7 DB6 DB5 DB4
IB7 IB6 IB5 IB4
IB3 IB2 IB1 IB0
IB7 IB6 IB5 IB4
IB3 IB2 IB1 IB0
BF= "0" IB6 IB5 IB4
IB3 IB2 IB1 IB0
IB7 IB6 IB5 IB4
IB3 IB2 IB1 IB0
Write Instruction
Write Instruction
Read Instruction
Write Data
Fig. 8. Typical 4-Bit Interface Sequence Using M68-Type Mode
AN-E-2266A [7/19]
3-1-2. INTEL I80-TYPE MODE This mode uses the Read (RD/) and Write (WR/) control signals to transfer information. Instructions/data are written to the module on the rising edge of WR/ and are read from the module after the falling edge of RD/. RS
WR/
RD/
DB7 DB6
IB7 IB6
IB7 IB6
BF="0" IB6
DB7 DB6
DB0
IB0
Write Instruction
IB0
Write Instruction
IB0
Read Instruction
DB0
Write Data
Fig. 9. Typical 8-Bit Parallel Interface Sequence Using I80-Type Mode
3-2. SYNCHRONOUS SERIAL INTERFACE MODE In the synchronous serial interface mode, instructions and data are sent between the host and the module using 8-bit bytes. Two bytes are required per read/write cycle and are transmitted MSB first. The start byte contains 5 high bits, the Read/Write (R/W) control bit, the Register Select (RS) control bit, and a low bit. The following byte contains the instruction/data bits. The R/W bit determines whether the cycle is a read (high) or a write (low) cycle. The RS bit is used to identify the second byte as an instruction (low) or data (high). This mode uses the Strobe (STB) control signal, Serial Clock (SCK) input, and Serial I/O (SI/SO) line to transfer information. In a write cycle, bits are clocked into the module on the rising edge of SCK. In a read cycle, bits in the start byte are clocked into the module on the rising edge of SCK. After the minimum wait time, each bit in the instruction/data byte can be read from the module after each falling edge of SCK. Each read/write cycle begins on the falling edge of STB and ends on the rising edge. To be a valid read/write cycle, the STB must go high at the end of the cycle.
AN-E-2266A [8/19]
STB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SCK
SI/SO
"1"
"1"
"1"
"1"
"1" R/W
RS
"0"
B7
B6
B5
B4
B3
B2
B1
B0
Start Byte
Instruction / Data
Fig. 10. Typical Synchronous Serial Interface Write Cycle
STB
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SCK
SI/SO
"1" "1" "1" "1" "1" R/W RS
"0"
B7
B6
B5
B4
B3
B2
B1
B0
Start Byte
Instruction / Data
Fig. 11. Typical Synchronous Serial Interface Read Cycle
3-3. RESET MODE The module is reset automatically at power-up by an internal R-C circuit.
AN-E-2266A [9/19]
4. FUNCTIONAL DESCRIPTION 4-1. ADDRESS COUNTER (AC) The AC stores the address of the data being written to and read from DDRAM or CGRAM. The AC increments by 1 (overflows from 27H to 40H and from 67H to 00H) or decrements by 1 (underflows from 40H to 27H and from 00H to 67H) after each DDRAM access. The AC increments by 1 (overflows from 3FH to 00H) or decrements by 1 (underflows from 00H to 3FH) after each CGRAM access. When addressing DDRAM, the value in the AC also represents the cursor position.
4-2. DISPLAY DATA RAM (DDRAM) The DDRAM stores the character code of each character being displayed on the VFD. Valid DDRAM addresses are 00H to 27H and 40H to 67H. DDRAM not being used for display characters can be used as general purpose RAM. The tables below show the relationship between the DDRAM address and the character position on the VFD before and after a display shift (with the number of display lines set to 2).
Relationship before a display shift (non-shifted): 1 2 3 4 5 6 7 8 9 10 11 1 00 01 02 03 04 05 06 07 08 09 0A 2 40 41 42 43 44 45 46 47 48 49 4A 3 14 15 16 17 18 19 1A 1B 1C 1D 1E 4 54 55 56 57 58 59 5A 5B 5C 5D 5E
12 0B 4B 1F 5F
13 0C 4C 20 60
14 0D 4D 21 61
15 0E 4E 22 62
16 0F 4F 23 63
17 10 50 24 64
18 11 51 25 65
19 12 52 26 66
20 13 53 27 67
Relationship after a display shift to the left: 1 2 3 4 5 6 7 8 9 10 01 02 03 04 05 06 07 08 09 0A 1 2 41 42 43 44 45 46 47 48 49 4A 3 15 16 17 18 19 1A 1B 1C 1D 1E 4 55 56 57 58 59 5A 5B 5C 5D 5E
11 0B 4B 1F 5F
12 0C 4C 20 60
13 0D 4D 21 61
14 0E 4E 22 62
15 0F 4F 23 63
16 10 50 24 64
17 11 51 25 65
18 12 52 26 66
19 13 53 27 67
20 14 54 00 40
Relationship after a display shift to the right: 1 2 3 4 5 6 7 8 9 10 1 27 00 01 02 03 04 05 06 07 08 2 67 40 41 42 43 44 45 46 47 48 3 13 14 15 16 17 18 19 1A 1B 1C 4 53 54 55 56 57 58 59 5A 5B 5C
11 09 49 1D 5D
12 0A 4A 1E 5E
13 0B 4B 1F 5F
14 0C 4C 20 60
15 0D 4D 21 61
16 0E 4E 22 62
17 0F 4F 23 63
18 10 50 24 64
19 11 51 25 65
20 12 52 26 66
AN-E-2266A [10/19]
4-3. CHARACTER GENERATOR RAM (CGRAM) The CGRAM stores the pixel information (1 = pixel on, 0 = pixel off) for the eight user-definable 5x8 characters. Valid CGRAM addresses are 00H to 3FH. CGRAM not being used to define characters can be used as general purpose RAM. Character codes 00H to 07H (or 08H to 0FH) are assigned to the user-definable characters (see section 5.0 Character Font Tables). The table below shows the relationship between the character codes, CGRAM addresses, and CGRAM data for each user-definable character.
Character Code CGRAM Address CGRAM Data D7D6 D5D4D3 D2D1D0 A5A4A3 A2A1A0 D7D6D5 D4D3D2 D1D0
0000x0000000 0 0 0 1 1 1 1 0000x0010010 0 0 0 1 1 1 1 0000x1111110 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
0xxx11111 1 10000 0 10000 1 1 0 0 0 0 CGRAM 0 11110 (1) 1 10000 0 10000 1 10000 0xxx01110 1 10001 0 10000 1 1 0 0 0 0 CGRAM (2) 0 10000 1 10000 0 10001 1 01110 0xxx00100 1 01010 0 10001 1 1 0 0 0 1 CGRAM (8) 0 10001 1 11111 0 10001 1 10001
4-4. INSTRUCTIONS Instruction Clear Display Cursor Home Entry Mode Set Display On/Off control Cursor/Display Shift Function Set CGRAM Address Set DDRAM Address Set Address Counter Read DDRAM or CGRAM Write DDRAM or CGRAM Read x=don't care RS 0 0 0 0 0 0 0 0 0 1 1 Table-9 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 x 0 0 0 0 0 0 1 I/D S 0 0 0 0 0 1 D C B 0 0 0 0 1 S/C R/L x x 0 0 0 1 DL N BR1 BR0 x 0 0 1 CGRAM Address 0 1 DDRAM Address 1 BF=0 AC Contents 0 Write Data 1 Read Data
AN-E-2266A [11/19]
4-4-1. CLEAR DISPLAY RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 0 1 This instruction clears the display (without affecting the contents of CGRAM) by performing the following. 1) 2) 3) 4) Fills all DDRAM locations with character code 20H (character code for a space). Sets the AC to DDRAM address 00H (i.e. sets cursor position to 00H). Returns the display to the non-shifted position. Sets the I/D bit to 1.
4-4-2. CURSOR HOME RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 1 x x=don't care This instruction returns the cursor to the home position (without affecting the contents of DDRAM or CGRAM) by performing the following. 1) Sets the AC to DDRAM address 00H (i.e. sets cursor position to 00H). 2) Returns the display to the non-shifted position.
4-4-3. ENTRY MODE SET RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 1 I/D S This instruction selects whether the AC (cursor position) increments or decrements after each DDRAM or CGRAM access and determines the direction the information on the display shifts after each DDRAM write. The instruction also enables or disables display shifts after each DDRAM write (information on the display does not shift after a DDRAM read or CGRAM access). DDRAM, CGRAM, and AC contents are not affected by this instruction. I/D = 0 : The AC decrements after each DDRAM or CGRAM access. If S=1, the information on the display shifts to the right by one character position after each DDRAM write. I/D = 1 : The AC increments after each DDRAM or CGRAM access. If S=1, the information on the display shifts to the left by one character position after each DDRAM write. S = 0 : The display shift function is disabled. S = 1 : The display shift function is enabled.
AN-E-2266A [12/19]
4-4-4. DISPLAY ON/OFF CONTROL RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 1 D C B This instruction selects whether the display and cursor are on or off and selects whether or not the character at the current cursor position blinks. DDRAM, CGRAM, and AC contents are not affected by this instruction. D = 0 : The display is off (display blank). D = 1 : The display is on (contents of DDRAM displayed). C = 0 : The cursor is off. C = 1 : The cursor is on (8th row of pixels). B = 0 : The blinking character function is disabled. B = 1 : The blinking character function is enabled (a character with all pixels on will alternate with the character displayed at the current cursor position at about a 1Hz rate with a 50% duty cycle).
4-4-5. CURSOR/DISPLAY SHIFT RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 1 S/C R/L x x x=don't care This instruction increments or decrements the AC (cursor position) and shifts the information on the display one character position to the left or right without accessing DDRAM or CGRAM. DDRAM and CGRAM contents are not affected by this instruction. If the AC was addressing CGRAM prior to this instruction, the AC will be addressing DDRAM after this instruction. However, if the AC was addressing DDRAM prior to this instruction, the AC will still be addressing DDRAM after this instruction. Table-10 S/C R/L AC Contents (cursor position) Information on the display 0 0 Decrements by one No change 0 1 Increments by one No change 1 0 Decrements by one Shifts on character position to the left 1 1 Increments by one Shifts on character position to the right
AN-E-2266A [13/19]
4-4-6. FUNCTION SET RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 1 DL N x BR1 BR0 x=don't care This instruction sets the width of the data bus for the parallel interface modes, the number of display lines, and the luminance level (brightness) of the VFD. DDRAM, CGRAM, and AC contents are not affected by this instruction. DL = 0 : Sets the data bus width for the parallel interface modes to 4-bit (DB7-DB4). DL = 1 : Sets the data bus width for the parallel interface modes to 8-bit (DB7-DB0). N = 0 : Sets the number of display lines to 1 (this setting is not recommended). N = 1 : Sets the number of display lines to 2 BR1, BR0 = 0,0: 0,1: 1,0: 1,1: Sets the luminance level to 100%. Sets the luminance level to 75%. Sets the luminance level to 50%. Sets the luminance level to 25%.
4-4-7. CGRAM ADDRESS SET RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 1 CG RAM Address This instruction places the 6-bit CGRAM address specified by DB5-DB0 into the AC (cursor position). Subsequent data writes (reads) will be to (from) CGRAM. DDRAM and CGRAM contents are not affected by this instruction. 4-4-8. DDRAM ADDRESS SET RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 1 DD RAM Address This instruction places the 7-bit DDRAM address specified by DB6-DB0 into the AC (cursor position). Subsequent data writes (reads) will be to (from) DDRAM. DDRAM and CGRAM contents are not affected by this instruction. 4-4-9. ADDRESS COUNTER READ RS 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 1 BF=0 AC Contents
This instruction reads the current 7-bit address from the AC on DB6-DB0 and the busy flag (BF) bit (always 0) on DB7. DDRAM, CGRAM, and AC contents are not affected by this instruction. Because the BF is always 0, the host never has to read the BF bit to determine if the module is busy before sending data or instructions. Therefore, data and instructions can be sent to the module continuously according to the E, WR/, and SCK cycle times specified in section 2.5 AC Timing Specifications. Due to this feature, the execution times for each instruction are not specified.
AN-E-2266A [14/19]
4-4-10. DDRAM OR CGRAM WRITE RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 1 0 Write data This instruction writes the 8-bit data byte on DB7-DB0 into the DDRAM or CGRAM location addressed by the AC. The most recent DDRAM or CGRAM Address Set instruction determines whether the write is to DDRAM or CGRAM. This instruction also increments or decrements the AC and shifts the display according to the I/D and S bits set by the Entry Mode Set instruction.
4-4-11. DDRAM OR CGRAM READ RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 1 1 Read data This instruction reads the 8-bit data byte from the DDRAM or CGRAM location addressed by the AC on DB7-DB0. The most recent DDRAM or CGRAM Address Set instruction determines whether the read is from DDRAM or CGRAM. This instruction also increments or decrements the AC and shifts the display according to the I/D and S bits set by the Entry Mode Set instruction. Before sending this instruction, a DDRAM or CGRAM Address Set instruction should be executed to set the AC to the desired DDRAM or CGRAM address to be read.
4-5. RESET CONDITIONS After a power-up reset, the module initializes to the following conditions: 1)All DDRAM locations are set to 20H (character code for a space). 2)The AC is set to DDRAM address 00H (i.e. sets cursor position to 00H). 3)The relationship between DDRAM addresses and character positions on the VFD is set to the non-shifted position. 4)Entry Mode Set instruction bits: I/D = 1: The AC increments after each DDRAM or CGRAM access. If S=1, the information on the display shifts to the left by one character position after each DDRAM write. S = 0: The display shift function is disabled. 5)Display On/Off Control instruction bits: D = 0: The display is off (display blank). C = 0: The cursor is off. B = 0: The blinking character function is disabled. 6)Function Set instruction bits: DL = 1: Sets the data bus width for the parallel interface modes to 8-bit (DB7-DB0). N = 1: Number of display lines set to 2. BR1,BR0=0,0: Sets the luminance level to 100%.
AN-E-2266A [15/19]
5. CONNECTOR INTERFACE Parallel Pin Serial (Intel) No. 1 GND GND 3 SI/SO NC 5 NC WR/ 7 NC DB0 9 NC DB2 11 NC DB4 13 NC DB6 NC = No Connection Parallel Pin (Motorola) No. GND 2 NC 4 R/W 6 DB0 8 DB2 10 DB4 12 DB6 14 Serial Vcc STB SCK NC NC NC NC Parallel (Intel) Vcc RS RD/ DB1 DB3 DB5 DB7 Table-11 Parallel (Motorola) Vcc RS E DB1 DB3 DB5 DB7
6. JUMPER SETTING Mode Parallel (Motorola) Parallel (Intel) Serial J3 open open shorted J4 shorted shorted open J5 open open shorted Table-12 J6 J7 shorted open open shorted shorted open
Note : JP3-JP7 must be set as shown above for either one of the parallel modes or for the serial mode. When the module is shipped , the parallel (Motorola) mode is set.
7. CIRCUIT BLOCK DIAGRAM
NC_RST/_SI/SO RS_STB R/W_WR/ E_RD/_SCK DB0-DB7 DOT MATRIX VFD CONTROLLER & DRIVER GRID DRIVER VACUUM FLUORESCENT DISPLAY 204-SD-02GN
Vcc GND
DC-DC/AC CONVERTER
AN-E-2266A [16/19]
M204SD02AJ MECHANICAL DRAWING FIGURE-1
AN-E-2266A [17/19]
M204SD02AJ CHARACTER FONT TABLES (English/European Font) FIGURE-2
D7 D6 D5 D4 D3 D2 D1 D0 0000 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1
0 0 1 2 3 4 5 6 7 8 9 A B C D E F
1
2
SP
3
4
5
6
7
8
9
A
B
C
D
E
F
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
SP : SPACE
AN-E-2266A [18/19]
8.
WARRANTY This display module is guaranteed for 1 year after a shipment from FUTABA.
9. OPERATING RECOMMENDATION 9-1. Since VFDs are made of glass material. Avoid applying excessive shock or vibration beyond the specification for the module. Careful handing is essential. 9-2. Applying lower voltage than the specified may cause non activation for selected pixels. Conversely, higher voltage may cause may non-selected pixel to be activated. If such a phenomenon is observed, check the voltage level of the power supply. 9-3. Avoid plugging or unplugging the interface connection with the power on. 9-4. If the start up time of the supply voltage is slow, the controller may not be reset. The supply voltage must be risen up to the specified voltage level within 30msec. 9-5. Avoid using the module where excessive noise interference is expected. Noise affects the interface signal and causes improper operation. Keep the length of the interface cable less than 50cm (When the longer cable is required, please contact FUTABA engineering.). 9-6. When power supply is turned off, the capacitor does not discharge immediately. The high voltage applied to the VFD must not contact the controller IC. (The shorting of the mounted components within 30 seconds after power off may cause damage.) 9-7. The fuse is mounted on the module as circuit protection. If the fuse blown, the problem shall be solved first and change the fuse. 9-8. When fixed pattern is displayed for long time, you may see uneven luminance. It is recommended to change the display patterns sometimes in order to keep best display quality.
REMARKS This specification is subject to change without prior in order improve the design and quality. Your consultation with FUTABA sales office is recommended for the use of this module.
AN-E-2266A [19/19]

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