GENERAL DESCRIPTION

INTRODUCTION

The ST72774, ST72754 and ST72734 are HCMOS microcontroller units (MCU) from the ST727x4 family with dedicated peripherals for Monitor applications.

They are based around an industry standard 8-bit core and offer an enhanced instruction set. The processor runs with an external clock at 12 or 24 MHz with a 5V supply. Due to the fully static design of this device, operation down to DC is possible. Under software control the ST727x4 can be placed in WAIT mode thus reducing power consumption. The HALT mode is no longer available.

■ User ROM/OTP/EPROM: up to 60 Kbytes

■ Data RAM: up to 1 Kbytes (256 bytes stack)

■ 8 MHz Internal Clock Frequency in fast mode, 4 MHz in normal mode

■ Run and Wait CPU modes

■ System protection against illegal address jumps and illegal opcode execution

■ Sync Processor for Mode Recognition, power management and composite video blanking, clamping and free-running frequency generation

– Corrector mode

– Analyzer mode

■ USB (Universal Serial Bus) for monitor function 1

– Three endpoints

– Integrated 3.3V voltage regulator

– Transceiver

– Suspend and Resume operations

■ Timing Measurement Unit (TMU) for autoposition and autosize 1

■ Fast I2C Single Master Interface

■ DDC Bus Interface with:

– DDC1/2B protocol implemented in hardware

– Programmable DDC CI modes

– Enhanced DDC (EDDC) address decoding

■ 31 I/O lines

■ 2 lines programmable as interrupt inputs

■ 16-bit timer with 2 input captures and 2 output compare functions

■ 8-bit Analog to Digital Converter with 4 channels on port B

■ 8 10-bit PWM/BRM Digital to Analog outputs

■ Master Reset and Low Voltage Detector (LVD) reset

■ Programmable Watchdog for system reliability

■ Fully static operation

■ 63 basic instructions / 17 main addressing modes

■ 8x8 unsigned multiply instruction

■ True bit manipulation

■ Complete development support on PC/DOSWindows: Real-Time Emulator, EPROM Programming Board and Gang Programmer

■ Full software package (assembler, linker, C-compiler, source level debugger)