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ST72753

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST72753 is a HCMOS microcontroller unit

(MCU) from the ST7 family with dedicated periph-

erals for Monitor applications.

It is based around an industry standard 8-bit core

and offers an enhanced instruction set. The proc-

essor runs with an external clock at 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 ST72753 can be placed in

WAIT or HALT mode thus reducing power con-

sumption. The enhanced instruction set and ad-

dressing modes afford real programming potential.

In addition to standard 8-bit data management the

ST7 features true bit manipulation, 8x8 unsigned

multiplication and indirect addressing modes.

The device includes an on-chip oscillator, CPU,

Sync Processor for video timing & Vfback analy-

sis, up to 32K ROM, up to 1K RAM, I/O, a timer

with 2 input captures and 2 output compares, a 4-

channel Analog to Digital Converter, DDC/DMA,

I

PWM/BRM outputs for analog DC control of exter-

nal functions.

Figure 1. ST72753 Block Diagram

SYNC

PROCESSOR

POWER

SU PPLY

OSC /3 or 6

POR T A

PORT C

DDC

TIM ER

WATCHDOG

PORT D

OCMP

PWM/BRM

PORT B

ADC

A IN 0..2, AIN7

32K Bytes

RAM

1K Bytes

CONTROL

8-BIT CORE

ALU

INTERNAL

CLOC K

OSCOUT

OSCIN

DA1,DA6

DDC DM A

PORT C

SCLD

SDAD

I²C

PA4-PA6 (HV)

PA7/BLANKOUT

PC3/SDAD

PC2/RX/SCLD

PC0/OCMP/HFBACK

RESET

HSYNCI

VSYNCI

PB1..2/AIN1..2

VFBACK/AIN0

PC4/SCLI

PC5/SDAI

PC6 (HC)

POWER ON/OFF

ROM/

Up to

Up to

PB0/

PD0/CSYNCI/ITA

PD1/HSYNCO

PD2/VSYNCO

PD3/ITC

PD6/CLAMPOUT

PB7/AIN7

EPROM/OTP