December 1997

3/5

This is preliminary information ona new product in development orundergoing evaluation. Details are subject to change without notice.

R

ST72E91L

ST72T91L

8-BIT MCU WITH 32K EPROM/ OTP, TIMER, SUPPLY

SUPERVISOR AND CARRIER FREQUENCY GENERATOR

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3 to 5.5V Supply Operating Range

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8MHz Maximum Clock Frequency

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Fully Static operation

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0to +70

°C Operating Temperature Range

(OTP)

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Run, Wait, Stop and RAM Retention modes

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User EPROM/ OTP: 32 Kbytes

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Data RAM:

/384 Bytes

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28 pin SO plastic packages for ST72T91 OTP

version

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28 pin Ceramic SO package for ST72E91

EPROM version

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21 Bidirectional I /O lines

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8 Interrupt Wake-Up programmable input lines

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16-bit Timer with Output Compare (no output

pin).

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Interrupt Wake-up function

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Low Voltage Detector (LVD)

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IR Carrier Frequency Generator

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8-bit Data Manipulation

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63 Basic Instructions

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17 main Addressing Modes

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8x8 Unsigned Multiply instruction

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True Bit Manipulation

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Complete Development Support on PC/DOS/

Windows 3.1x/95/NT with Real-Time Emulator

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Full

Software

Package

(Cross-Assembler,

Debugger)

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Full Hardware Emulator

Figure 1. Pin Description

(See end of Datasheet for Ordering Information)

PSO28

CSO28W

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

RESET

WKP

PA7

PA6

PA1

PC0

PA5

PA4

PA3

OSCin

OSCout

PC1/OP

PC6

PC7

PB6

PB5

PB4

PB3

PB2

28

27

26

25

24

23

22

21

PA2

PA0

PB0

PB1

PC5

PB7