R
ST7291L
BRIEF DATA
8-BIT MCU WITH 8/12/16/24/32K ROM, TIMER, SUPPLY
SUPERVISOR AND CARRIER FREQUENCY GENERATOR
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
2 to 5.5V Supply Operating Range
8MHz Maximum Clock Frequency
Fully Static Operation
0 to +70°C Operating Temperature Range
Run, Wait, Stop and RAM Retention modes
User ROM: 12/16/24/ 32 Kbytes
Data RAM: 256/384 bytes
28 pin SO Plastic Packages
21 Bidirectional I/O lines
8 standard Push-pull I/Os with wake-up feature
13 standard Push-pull I/Os
16-bit Timer with Output Compare (no output
pin)
Low Voltage Detector (LVD)
Interrupt Wake-up function
IR Carrier Frequency Generator
8-bit Data Manipulation
63 Basic Instructions
17 main Addressing Modes
8x8 Unsigned Multiply instruction
True Bit Manipulation
Complete Development Support on PC/DOS/
Windows 3.1x/95/NT with Real-Time Emulator
Full Software Package (Cross -Assembler,
Debugger)
Full Hardware Emulator
EPROM and OTP support
PSO28
(See end of Datasheet for Ordering Information)
Note 1.
This device is in development, consult your
SGS-TH OMSON representative for the current status.
Figure 1. Pin Description
V
DD
RESET
WKP
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PC0
PA0
PB0
PB1
OSCin
OSCout
PC1/OP
(1)
PC6
PC7
V
SS
TEST
PC5
PB7
PB6
PB5
PB4
PB3
PB2
DEVICE SUMMARY
DEVICE
ST7291L6
(1)
ST7291L5
ST7291L5A
ST7291L4
ST7291L3
ST7291L2
ROM
(Bytes)
RAM
(Bytes)
CARRIER
GENERATOR
Yes
Yes
Yes
No
No
No
32K
24K
16K
16K
12K
8K
384
384
384
256
256
256
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Notes:
1. PC1 on ST7291L2/L3/L4; software selectable as OP on
ST7291L6/L5/L5A
December 1997
This is preliminary information ona new product in development orundergoing evaluation. Details are subject to change without notice.
1/5
1
ST7291L
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST7291L CMOS Microcontroller Unit is a
member of the ST7 family of microcontrollers. The
device is based on an industry-standard 8-bit core
and features an enhanced instruction set. Oscilla-
tor frequency may be as high as 8MHz, however,
thanks to the fully static design, operation is possi-
ble down to DC. Under software control, the
ST7291L may be placed in either WAIT or HALT
modes, thus reducing power consumption.
Figure 2. ST7291L Block Diagram
The enhanced instruction set and addressing
modes afford real programming potential. In addi-
tion to standard 8-bit data management, the
ST7291L features bit manipulation, 8x8 unsigned
multiplication and indirect addressing modes.
The device includes a CPU, ROM, RAM, I/O, an
on-chip oscillator, a timer with output compare
system and, depending on the version, a Low Volt-
age Detection (LVD) and Carrier Frequency gen-
eration for remote control applications.
OSCin
OSCout
WKP
OSCILLATOR
Internal
CLOCK
PORT A
PA0..PA7 (8-bit)
PORT B
PB0..PB7 (8-bit)
PC0, PC1, PC6, PC7
PC5
PORT C
RESET
CONTROL
8 BIT CORE
PCL
PCH
SP
X
Y
A
CC
TIMER
SYSTEM
DATA BUS
CARRIER FREQ.
GENERATOR
ADDRESS BUS
ROM
8K/12K/16K/24K/32K
RAM
256/384
LOW VOLTAGE
DETECTOR
V
DD
V
PP
2/5
R
ST72E91L
ST72T91L
8-BIT MCU WITH 32K EPROM/ OTP, TIMER, SUPPLY
SUPERVISOR AND CARRIER FREQUENCY GENERATOR
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
3 to 5.5V Supply Operating Range
8MHz Maximum Clock Frequency
Fully Static operation
0 to +70°C Operating Temperature Range
(OTP)
Run, Wait, Stop and RAM Retention modes
User EPROM/ OTP: 32 Kbytes
Data RAM: /384 Bytes
28 pin SO plastic packages for ST72T91 OTP
version
28 pin Ceramic SO package for ST72E91
EPROM version
21 Bidirectional I /O lines
8 Interrupt Wake-Up programmable input lines
16-bit Timer with Output Compare (no output
pin).
Interrupt Wake-up function
Low Voltage Detector (LVD)
IR Carrier Frequency Generator
8-bit Data Manipulation
63 Basic Instructions
17 main Addressing Modes
8x8 Unsigned Multiply instruction
True Bit Manipulation
Complete Development Support on PC/DOS/
Windows 3.1x/95/NT with Real-Time Emulator
Full Software Package (Cross-Assembler,
Debugger)
Full Hardware Emulator
PSO28
CSO28W
(See end of Datasheet for Ordering Information)
Figure 1. Pin Description
V
DD
RESET
WKP
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PC0
PA0
PB0
PB1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
OSCin
OSCout
PC1/OP
PC6
PC7
V
SS
TEST/V
PP
PC5
PB7
PB6
PB5
PB4
PB3
PB2
December 1997
This is preliminary information ona new product in development orundergoing evaluation. Details are subject to change without notice.
3/5
ST72E91L ST72T91L
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST72E91 and ST72T91 devices form part of
the ST 7 family of Microcontrollers, designed and
produced by SGS-THOMSON Microelectronics
using an n-well proprietary HCMOS process. The
ST72E91 is equipped with internal EPROM mem-
ory and is available in windowed ceramic package,
whereas the ST72T91 OTP version is available in
a plastic package. The EPROM parts are fully
compatible with their ROM versions and the
present Datasheet will thus provide only informa-
tion specifically relating to the EPROM devices.
trade-off for prototyping, pre-production and most
low to medium volume applications.
Both devices are based around an industry stand-
ard 8-bit core and offer an enhanced instruction
set. The processors will run at an 8MHz clock rate
with a 5V supply, and at up to 4MHz with a 3V
supply. Since the design is fully static, operation
down to DC is possible and the devices may be
placed in HALT or WAIT modes under program
control in order to reduce power requirements.
The powerful enhanced instruction set and ad-
dressing modes afford real programming potential.
In addition to standard 8-bit data management, the
ST72E91 and the ST72T91 feature true bit manip-
ulation, 8x8 unsigned multiplication and indirect
addressing modes. The devices include a CPU, an
on-chip oscillator, EPROM, RAM, I/O, and a timer
with output compare system.
PLEASE REFER TO THE ST7291 DATASHEET
FOR THE ROM DEVICES FOR FULL DETAILS
.
The ST72E91 is a user programmable and erasa-
ble device, best suited for development purposes.
The ST72T91 is a One-Time Programmable de-
vice (OTP) which offers the best cost/flexibility
Figure 2. ST72E91 Block Diagram
OSCin
OSCout
WKP
OSCILLATOR
Internal
CLOCK
PORT A
PA0..PA7 (8-bit)
PORT B
PB0..PB7 (8-bit)
PORT C
RESET
CONTROL
8 BIT CORE
PCL
PCH
SP
X
Y
A
CC
TIMER
SYSTEM
PC0,PC1,PC5,PC6,PC7
DATA BUS
CARRIER FREQ.
GENERATOR
ADDRESS BUS
EPROM/OTP
32K
RAM
256/384
LOW VOLTAGE
DETECTOR
V
DD
V
PP
4/5
ST72E91L ST72T91L
Notes:
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.
©1997
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.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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