SGS Thomson Microelectronics ST72T751N9B1, ST72E751N9D1, ST72751N9, ST72751N7, ST72751N6 Datasheet

April 1998 1/3

This is preliminary information on a new product in development or undergoing evaluation. Details are subject to change without noti ce.

R

ST7275-1

8-BIT, 56-PIN MCU FOR MONITORS, WITH UP TO 60K ROM, 2K

RAM, ADC, TIMER, IR, SYNC, PWM/BRM, DDC/DMA, I

2

C & SCI

PRODUCT PREVIEW

■

User ROM/OTP/EPROM: up to 60 Kbytes

■

Data RAM: up to 2 Kbytes (256 bytes stack)

■

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

■

Run, Wait and Halt CPU modes

■

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

– Corrector mode
– Analyzer mode

■

Fast I2C Multi Master Interface

■

DDC Bus Interface fully compliant with DDC1,
2B, 2B+, 2AB, 2Bi standards

■

32 I/O lines
– 8 Open Drain I/Os with high current capacity

(10 mA) on port A

– 5 lines programmable as interrupt inputs

■

16-bit timer with 2 in put captures an d 2 output
compare functions (with 1 output pin)

■

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

■

8 10-bit PWM/BRM Digital to Analog outputs

■

One 12-bit PWM/BRM Digital to Analog output

■

Asynchronous Serial Communications
Interface

■

Infra red controller

■

Master Reset and Power on/off reset1

■

Programmable Watchdog for system reliability

■

56-pin Shrink Dual In line Plastic package

■

Fully static operation

■

0 to + 70 oC operating temperature range

■

4.0V to 5.5V supply operating range

■

24 MHz Quartz Oscillator

■

63 basic instructions/17 main address modes

■

8x8 unsigned multiply instruction

■

True bit manipulation

■

Versatile Development Tools (DOS and
Windows) including assembler, linker, C­compiler, archiver, source level debugger,
EPROM programme r and hardware emula tor

Device Summary

Note 1

: Power On/Off reset not implemented in

this revision.

Features ST72751N9 ST72751N7 ST72751N6

ROM
(bytes)

60K 48K 32K

RAM
(bytes)

2K 1.5 1

ADC 8 channels
Timer 1
I

2

C Bus one multimaster
DDC/DMA yes
Sync yes
PWM 9
I/O 32
SCI yes
IR yes
EPROM

Device

ST72E751N9D1

OTP
Device

ST72T751N9B1

PSDIP56

See Ordering Information at the end of the Document

1

2/3

ST7275-1

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST7275 is a HCMOS microcontroller unit
(MCU) from the ST7 family with dedicated periph­erals for Monitor applications.
It is based around an indu stry standard 8-bi t core
and offers an enhanced i nstruction set. The proc­essor runs with an external clock at 24 MHz with
a 5V supply. Due to the fully static de sign of this
device, operation down to DC is possible. Under
software control the ST7275 can be placed in
WAIT or HALT mode thus reducing power con­sumption. The enhanced instruction set and ad­dressing 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 & Vfbac k analy­sis, up to 60K ROM, up to 2K RAM, I/O, a timer
with 2 input captures and 2 output compares, an 8­channel Analog to Digital Converter, DDC/DMA,
I

2

C multi Master, SCI Serial Comm unications In­terface, Watchdog Reset, an Infra Red Control
preprocessor, and one 12-bit and eight 10-bit
PWM/BRM outputs for analog DC control of exter­nal functions.

Figure 1. ST7275-1 Block Diagram

SYNC

PROCES SO R

POWER

SUPPLY

OSC /3 or 6

V

DD

PORT A

PORT C

P

C

L

A

D

D

R

E

S

S

/

D

A

T

A

B

U

S

E

S

DDC

TIMER

WATCHDOG

PORT D

C

S

Y

N

C

I

H

S

Y

N

C

O

V

S

Y

N

C

O

H

/

C

S

Y

N

C

V

S

Y

N

C

OCMP

C

L

A

M

P

O

U

T

PWM/BRM

PORT B

ADC

AIN 0-AIN7

DA0

60K Bytes

RAM

2K Bytes

CONTROL

8-BIT CORE

ALU

P

C

H

S

P

X

Y

A

C

C

INTERNAL

CLOCK

V

SS

OSCOUTOSCIN

DA1,DA8

H

S

Y

N

C

I

2

V

S

Y

N

C

I

2

DDC DMA

H

F

B

A

C

K

PORT C

SCLD

SDAD

I²C

INF R A R E D

S

C

L

I

S

D

A

I

SCI

(UAR T)

VR017 35Q

PA0..6

PA7/BLANKOUT

V

DDA

V

SSA

PC3/SDAD
PC2/RX/SCLD

PC0/OCMP/HFBACK

RESET

HSYNCI1

VSYNCI1

PB1..7/ AIN1..7

VFBACK/AIN0

PC1/HSYNCI2

PC4/SCLI

PC5/SDAI

PC6/RDI

PC7/TDO

IRIN

POWER ON/OFF

TDO

RDI

ROM/

Up to

Up to

PB0/

PD0/CSYNCI

PD1/HSYNCO

PD2/VSYNCO

PD3/ITC

PD4/ITB

PD5/ITA

PD6/CLAMPOUT

PD7/VSYNCI2/ITD

OTP/EPROM

V

F

B

A

C

K