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VRS51L3174
Technical Brief
Rev 1.0
FRAM Enhanced High Performance 8051 MCU
Overview
The VRS51L3174 is a high performance, 8051-based microcontroller coupled with a fully integrated array of peripherals for addressing a broad range of embedded design applications. Based on a powerful 40-MIPS, single-cycle, 8051 microprocessor, the VRS51L3174's memory sub-system features 64KB of Flash and 4352 bytes of SRAM and 8192 bytes of nonvolatile FRAM (ferroelectric random access memory) memory. Support peripherals include a hardware based arithmetic unit capable of performing complex mathematical operations, a JTAG interface for Flash programming and non-intrusive in-circuit debugging/emulation, an internal oscillator, and a watchdog timer. Communication and control of external devices is facilitated via an assortment of digital peripherals such as an enhanced, fully configurable SPI bus, an IC interface, dual UARTs with dedicated baud rate generators, three 16-bit timers, 8 PWM controllers each with a 16-bit timer, and 2 pulse width counter modules. The VRS51L3174 operates from 3.0 to 3.6 volts over the industrial temperature range and is available in a QFP-44 package. The device features an active-low reset and is pincompatible with an industry standard 8051 microcontroller footprint.
FIGURE 1: VRS51L3174 FUNCTIONAL DIAGRAM
Feature Set
o o o o o o o o o o o o o o o o o o o o o 8051 High Performance Single Cycle Processor (Operation up to 40 MIPS) 64KB Flash Program Memory (In-System/ln-Application Programmable) 4352 Bytes of SRAM (4KB + 256) (Ext. 4KB can be used for program or data memory) 8192 Bytes of on-chip FRAM memory JTAG Interface for Flash Programming and Non-Intrusive Debugging/In-Circuit Emulation MULT/DIV/ACCU Unit including Barrel Shifter 40 General Purpose I/Os 2 Serial UARTs/2 Baud Rate Generators (20-bit resolution) Enhanced SPI Interface (fully configurable word size) 2 Fully Configurable I C Interface (Master/Slave) 16 External Interrupt Pins/Interrupt On Port Pin Change 16-bit General Purpose Timer/Counters 2 Pulse Width Counter Modules 8 PWM Controller Outputs with Individual Timers PWMs can be used as General Purpose Timers Internal Oscillator Dynamic System Clock Frequency Adjustment Power Saving Features Power-On Reset/Brown-Out Detect Watchdog Timer Operating voltage: 3.0V to 3.6V Operating Temperature -40C to +85C
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FIGURE 2: VRS51L3174 QFP-44
Ramtron International Corporation 1850 Ramtron Drive Colorado Springs Colorado, USA, 80921

http://www.ramtron.com mcuinfo@ramtron.com 1-800-545-FRAM, 1-719-481-7000

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