W78L54 8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78L54 microcontroller supplies a wider frequency and supply voltage range than most 8-bit microcontrollers on the market. It is compatible with the industry standard 80C54 microcontroller series. The W78L54 contains four 8-bit bidirectional parallel ports, one extra 4-bit bit-addressable I/O port (Port 4) and two additional external interrupts (INT2 , INT3 ), three 16-bit timer/counters, one watchdog timer and a serial port. These peripherals are supported by a eight-source, two-level interrupt capability. There are 256 bytes of RAM and an 16K byte mask ROM for application programs. The W78L54 microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode turns off the processor clock but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor.
FEATURES
* Fully static design * Supply voltage of 1.8V to 5.5V * DC-24 MHz operation * 256 bytes of on-chip scratchpad RAM * 16K bytes of on-chip mask ROM * 64K bytes program memory address space * 64K bytes data memory address space * Four 8-bit bidirectional ports * Three 16-bit timer/counters * One full duplex serial port * Eight-source, two-level interrupt capability * One extra 4-bit bit-addressable I/O port * Two additional external interrupts INT2 / INT3 * Watchdog timer * EMI reduction mode * Built-in power management * Code protection * Packages:
- DIP 40: W78L54-24 - PLCC 44: W78L54P-24 - QFP 44: W78L54F-24
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Publication Release Date: Sep. 1998 Revision A0
W78L54
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