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ST7277

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST7277 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 ST7277 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 60K ROM, up to 2K RAM, USB/DMA, I/

O, a timer with 2 input captures and 2 output com-

pares, an 8-channel Analog to Digital Converter,

cations Interface, Watchdog Reset, an Infra Red

Control preprocessor, and one 12-bit and eight 10-

bit PWM/BRM outputs for analog DC control of ex-

ternal functions.

Figure 1. ST7277 Block Diagram

SYNC

PROCESSOR

POWER

SUPPLY

OSC /3 or 6

PO RT A

PORT C

DDC

TIMER

W ATCHDOG

PORT D

OCMP

PW M/BRM

PORT B

ADC

AIN 0-AIN7

DA0

60K Bytes

RAM

2K Bytes

USB

SIE

CONTROL

8-BIT CO RE

ALU

INTERNAL

CLOCK

OSCOUT

OSCIN

DA1,DA8

DDC DMA

PORT C

SCL D

SDAD

I C

INFRA RED

USB DMA

SCI

(UART)

VR01735Q

PA0-PA6 PA7/BLANKOUT

PC3/SDAD

PC2/RX/SCLD

PC0/O CMP/HFBACK

RESET

HSYNCI1

VSYN CI1

PB1..7/AIN1..7

VFBAC K/AIN0

PC1/HSYN CI2

PC4/SCLI

PC5/SDAI

PC6/RD I

PC7/TDO

IR IN

USBDP

USBDM

USBGND

POWER ON/OFF

TDO

ROM

Up to

Up to

PB 0/

PD0/CSYNCI

PD1/HSYNCO

PD2/VSYNCO

PD3/ITC

PD4/ITB

PD5/ITA

PD6/CLAMPOUT

PD7/VSYNCI2