IS80LV51

IS80LV31

Integrated Silicon Solution, Inc.

1

10/01/98

This document contains ADVANCE INFORMATION data. ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible

product. We assume no responsibility for any errors which may appear in this publication. © Copyright 1998, Integrated Silicon Solution, Inc.

IS80LV51

IS80LV31

CMOS SINGLE CHIP

LOW VOLTAGE

8-BIT MICROCONTROLLER

ADVANCE INFORMATION

OCTOBER 1998

FEATURES

• 80C51 based architecture

• 4K x 8 ROM (IS80LV51 only)

• 128 x 8 RAM

• Two 16-bit Timer/Counters

• Full duplex serial channel

• Boolean processor

• Four 8-bit I/O ports, 32 I/O lines

• Memory addressing capability

– 64K ROM and 64K RAM

• Programmable lock

– Lock bits (2)

•

Power save modes:

– Idle and power-down

• Six interrupt sources

• Most instructions execute in 0.3

µs

• CMOS and TTL compatible

• Maximum speed: 40 MHz @ Vcc = 3.3V

• Industrial temperature available

• Packages available:

– 40-pin DIP

– 44-pin PLCC

– 44-Pin PQFP

GENERAL DESCRIPTION

The

microcontrollers fabricated using high-density CMOS

technology. The CMOS IS80LV51/31 is functionally

compatible with the industry standard 80C51

microcontrollers.

The IS80LV51/31 is designed with 4K x 8 ROM (IS80LV51

only); 128 x 8 RAM; 32 programmable I/O lines; a serial

I/O port for either multiprocessor communications, I/O

expansion or full duplex UART; two 16-bit timer/counters;

a six-source, two-priority-level, nested interrupt structure;

and an on-chip oscillator and clock circuit. The

IS80LV51/31 can be expanded using standard TTL

compatible memory.

Figure 1. IS80LV51/31 Pin Configuration: 40-pin PDIP

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

RST

RxD/P3.0

TxD/P3.1

INT0/P3.2

INT1/P3.3

T0/P3.4

T1/P3.5

WR/P3.6

RD/P3.7

XTAL2

XTAL1

GND

VCC

P0.0/AD0

P0.1/AD1

P0.2/AD2

P0.3/AD3

P0.4/AD4

P0.5/AD5

P0.6/AD6

P0.7/AD7

EA/VPP

ALE/PROG

PSEN

P2.7/A15

P2.6/A14

P2.5/A13

P2.4/A12

P2.3/A11

P2.2/A10

P2.1/A9

P2.0/A8