IN80CL31N/IN80CL51N

1

CMOS LOW-VOLTAGE SINGLE-CHIP 8-BIT MICROCONTROLLER

The 80CL31/80CL51 is a high-performance microcontroller fabricated with high-density

CMOS technology. The instruction set is based on that the 80C51.The 80CL51 is general

purpose microcontroller especially suited for battery powered applications. The device has

low power consumption and a wide range of supply voltage.

The 80CL51 contains a 4k x 8 ROM , a 128 x 8 RAM , 32 I/O lines, two 16-bit

counter/timers, a five-source, two-priority level nested interrupt structure, a serial I/O port

for either multi-processor communications, I/O expansion or full duplex UART, and on-

chip oscillator and clock circuits.

The device has two software selectable modes of power reduction

 idle mode and

power-down mode. The idle mode freezes the CPU while allowing the RAM, timers, serial

port, and interrupt system to continue functioning. The power-down mode saves the RAM

contents but freezes the oscillator, causing all other chip functions to be inoperative.

FEATURES

 Full static 80C51 CPU

 4k x 8 ROM (80CL51)

 ROMless (80CL31)

 128 x 8 RAM

 Two 16-bit counter/timers

 Full duplex serial channel

 Boolean processor

 Memory addressing capability

 64k ROM and 64k RAM

 Power control modes:

 Idle mode

 Power-down mode

 CMOS and TTL compatible

 Thirteen source, thirteen vector

interrupt structure with two priority levels

 Wake-up via external interrupts in

Port1

 Single supply voltage of 1.8V to 6.0V

 Frequency range of 0 to 16 MHz

 Very low current consumption

PIN CONFIGURATIONS

PL A S T IC

DUAL

IN -L IN E

P A C KAG E

39

1

2

3

4

5

40

6

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

P1 .0

I NT2 /P 1 .0

I NT4 /P 1 .2

I NT5 /P 1 .3

I NT6 /P 1 .4

I NT7 /P 1 .5

T A/P 3 .0

O CK /P 3 .2

I NT3 /P 1 .1

9

7

I NT8 /P 1 .6

I NT9 /P 1 .7

RS T

T0 /P 3 .4

T1 /P 3 .5

WR /P 3 6

RD /P 3 .7

XT A L 2

XT A L 1

Vs s

Vc c

P0 .0 /A D 0

P0 .1 /A D 1

P0 .2 /A D 2

P0 .3 /A D 3

P0 .4 /A D 4

P0 .5 /A D 5

P0 .6 /A D 6

P0 .7 /A D 6

EA

AL E

PS E N

P2 .7 /A 1 5

P2 .6 /A 1 4

P2 .5 /A 1 3

P2 .4 /A 1 2

P2 .3 /A 1 1

P2 .2 /A 1 0

P2 .1 /A 9

P2 .0 /A 8

IN T 0 /P 3 .2

IN T 1 /P 3 .3

CMOS single-chip 8-bit microcontroller 80CL31/80CL51