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GENERAL DESCRIPTION

INTRODUCTION

The ST7291L CMOS Microcontroller Unit is a member of the ST7 family of microcontrollers. The device is based on an industry-standard 8-bit core and features an enhanced instruction set. Oscillator frequency may be as high as 8MHz, however, thanks to the fully static design, operation is possible down to DC. Under software control, the ST7291L may be placed in either WAIT or HALT modes, thus reducing power consumption.

■ 2 to 5.5V Supply Operating Range

■ 8MHz Maximum Clock Frequency

■ Fully Static Operation

■ 0 to +70°C Operating Temperature Range

■ Run, Wait, Stop and RAM Retention modes

■ User ROM: 12/16/24/32 Kbytes

■ Data RAM: 256/384 bytes

■ 28 pin SO Plastic Packages

■ 21 Bidirectional I/O lines

■ 8 standard Push-pull I/Os with wake-up feature 13 standard Push-pull I/Os

■ 16-bit Timer with Output Compare (no output pin)

■ Low Voltage Detector (LVD)

■ Interrupt Wake-up function

■ IR Carrier Frequency Generator

■ 8-bit Data Manipulation

■ 63 Basic Instructions

■ 17 main Addressing Modes

■ 8x8 Unsigned Multiply instruction

■ True Bit Manipulation

■ Complete Development Support on PC/DOS/ Windows 3.1x/95/NT with Real-Time Emulator

■ Full Software Package (Cross-Assembler, Debugger)

■ Full Hardware Emulator

■ EPROM and OTP support