April 1998
1/3
This is preliminary information on a new product in development orundergoing evaluation. Detailsare subject to change without notice.
ST7277
8-BIT USB MCU FOR MONITORS WITH UP TO 60K ROM, 2K RAM,
ADC, TIMER, INFRA RED, SYNC, PWM/BRM, DDC/DMA, I
2
C & SCI
BRIEF DATA
s
User ROM: up to 60 Kbytes
s
Data RAM: up to 2 Kbytes (256 bytes stack)
s
8 MHz Maximum Internal Clock Frequency in
fast mode, 4 MHz in normal mode
s
Run, Wait and Halt CPU modes
s
RAM Retention Mode
s
Sync Processor for Mode Recognition, power
management and composite video blanking,
clamping
and
free-running
frequency
generation.
Corrector mode
Analyzer mode
s
USB (Universal Serial Bus) for monitor function
Integrated 3.3V voltage regulator
Integrated Transceiver
Suspend and Resume operations
s
Fast I
2
C Multi Master Interface
s
DDC Bus Interface fully compliant with DDC1,
2B, 2B+, 2AB, 2Bi standards
s
32 I/O lines
8 Open Drain I/Os with high current capacity
(10 mA) on port A
5 lines programmable as interrupt inputs
s
16-bit timer with 2 input captures and 2 output
compare functions (with 1 output pin)
s
8-bit
Analog
to Digital
Converter
with
8
channels on port B
s
8 10-bit PWM/BRM Digital to Analog outputs
s
One 12-bit PWM/BRM Digital to Analog output
s
Asynchronous
Serial
Communications
Interface
s
Infra red controller
s
Master Reset and Power on/off reset
1
s
Programmable Watchdog for system reliability
s
56-pin Shrink Dual In line Plastic package or 64-
pin Plastic Quad Flat Pack
s
Fully static operation
s
0 to + 70
o
C Operating Temperature Range
s
4.0V to 5.5V supply operating range
s
24 MHz Quartz Oscillator
s
63 basic instructions/17 main address modes
s
8x8 unsigned multiply instruction
s
True bit manipulation
s
Versatile
Development
Tools
(DOS
and
Windows)
including
assembler,
linker,
C-
compiler, archiver, source level debugger, and
hardware emulator
Note 1: Power On/Off reset not implemented in
this revision.
PQFP64
PSDIP56
See Ordering Information at the end of the Document
1
2/3
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,
DDC/DMA, I
2
C multi Master, SCI Serial Communi-
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
V
DD
PO RT A
PORT C
P
C
L
A
D
D
R
E
S
S
/
D
A
T
A
B
U
S
E
S
DDC
TIMER
W ATCHDOG
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
PW M/BRM
PORT B
ADC
AIN 0-AIN7
DA0
60K Bytes
RAM
2K Bytes
USB
SIE
CONTROL
8-BIT CO RE
ALU
P
C
H
S
P
X
Y
A
C
C
INTERNAL
CLOCK
V
SS
OSCOUT
OSCIN
DA1,DA8
H
S
Y
N
C
I
2
V
S
Y
N
C
I
2
DDC DMA
H
F
B
A
C
K
/
V
F
B
A
C
K
PORT C
SCL D
SDAD
I C
INFRA RED
S
C
L
I
S
D
A
I
USB DMA
SCI
(UART)
VR01735Q
PA0-PA6 PA7/BLANKOUT
V
D D A
V
S S A
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
USBV
C C
USBDP
USBDM
USBGND
POWER ON/OFF
TDO
RDI
ROM
Up to
Up to
PB 0/
PD0/CSYNCI
PD1/HSYNCO
PD2/VSYNCO
PD3/ITC
PD4/ITB
PD5/ITA
PD6/CLAMPOUT
PD7/VSYNCI2
3/3
ST7277
1.2 DEVICE SUMMARY
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-THOMS ON 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-THOMSO N Microelectronics - All Rights Reserved.
Purchase of I
2
C Components by SGS-THO MSON 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.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore
Spain - Sweden - Swit zerland - Taiwan - Thailand - United Kingdom - U.S.A.
PSDIP56
ST72771N9B1
ST72771N6B1
ST72771N5B1
ST72771N4B1
PQFP64
ST72771R9Q1
ST72771R6Q1
ST72771R5Q1
ST72771R4Q1
ROM (bytes)
60K
32K
24K
16K
RAM (bytes)
2K
1K
768
512
ADC
8 channels
8 channels
8 channels
8 channels
16-Bit Timer
1
1
1
1
I2C Bus
one multimaster
one multimaster
one multimaster
one multimaster
DDC/DMA
yes
yes
yes
yes
Sync Processor
yes
yes
yes
yes
PWM
9
9
9
9
I/O
32
32
32
32
USB
yes
yes
yes
yes
IR
yes
yes
yes
yes
SCI
yes
yes
yes
yes
EPROM Device
ST72E771N9D1 (CSDIP56) or ST72E771R9G1 (CQFP64)
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