R
ST7275-1
PRODUCT PREVIEW
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
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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 I
2
C 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 input captures and 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 reset
1
Programmable Watchdog for system reliability
56-pin Shrink Dual In line Plastic package
Fully static operation
0 to + 70
o
C 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, C-
compiler, archiver, source level debugger,
EPROM programmer and hardware emulator
PSDIP56
See Ordering Information at the end of the Document
Device Summary
Features
ROM
(bytes)
RAM
(bytes)
ADC
Timer
I
2
C Bus
DDC/DMA
Sync
PWM
I/O
SCI
IR
EPROM
Device
OTP
Device
ST72751N9
60K
2K
ST72751N7
48K
1.5
8 channels
1
one multimaster
yes
yes
9
32
yes
yes
ST72E751N9D1
ST72T751N9B1
ST72751N6
32K
1
Note 1:
Power On/Off reset not implemented in
this revision.
April 1998
This is preliminary information on a new product in development or undergoing evaluation. Details are subject to change without notice.
1/3
1
ST7275-1
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST7275 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 ST7275 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, I/O, a timer
with 2 input captures and 2 output compares, an 8-
channel Analog to Digital Converter, DDC/DMA,
I
2
C multi Master, SCI Serial Communications In-
terface, Watchdog Reset, an Infra Red Control
preprocessor, and one 12-bit and eight 10-bit
PWM/BRM outputs for analog DC control of exter-
nal functions.
Figure 1. ST7275-1 Block Diagram
PORT A
Up to 60K Bytes
ROM/
OTP/EPROM
INFRA RED
PA0..6
PA7/BLANKOUT
V
D D A
V
S S A
IRIN
Up to 2K Bytes
RAM
ADC
PORT B
AIN 0-AIN7
PB1..7/ AIN1..7
PB0/ VFBACK/AIN0
TDO
SCI
(UART)
ADDRESS / DATA BUSES
I²C
SDAI
RDI
DDC
PORT C
OCMP
DDC DMA
TIMER
WATCHDOG
H/CSYNC
HSYNCI2
VSYNC
SCLI
SCLD
SDAD
PC7/TDO
PC6/RDI
PC5/SDAI
PC4/SCLI
PC3/SDAD
PC2/RX/SCLD
PC1/HSYNCI2
PC0/OCMP/HFBACK
RESET
CONTROL
8-BIT CORE
ALU
PCL
PCH
SP
X
Y
A
CC
SYNC
PROCESSOR
HFBACK
VFBACK
VSYNCI1
HSYNCI1
PD7/VSYNCI2/ITD
PD6/CLAMPOUT
PD5/ITA
PD4/ITB
PD3/ITC
PD2/VSYNCO
PD1/HSYNCO
PD0/CSYNCI
DA0
DA1,DA8
VSYNCO
CLAMPOUT
POWER ON/OFF
PORT D
POWER
SUPPLY
INTERNAL
CLOCK
OSC /3 or 6
PWM/BRM
V
DD
V
SS
OSCIN OSCOUT
CSYNCI
HSYNCO
VSYNCI2
VR01735Q
2/3
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no
responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights
of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice.
This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products
are not authorized for use as critical components in life support devices or systems without the express written approval
of SGS-THOMSON Microelectronics.
©1998
SGS-THOMSON Microelectronics - All Rights Reserved.
Purchase of I
2
C Components by SGS-THOMSON Microelectronics conveys a license under the Philips I
2
C Patent. Rights to use these
components in an I
2
C system is granted provided that the system conforms to the I
2
C Standard Specification as defined by Philips.
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