COP820CJ datasheet(6/32 Pages) NSC

Part #	COP820CJ

Description	8-Bit Microcontroller with Multi-Input Wake Up and Brown Out Detector

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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COP820CJ Pin Assignment

Port

Typ

ALT

16

20

28

Funct

L0

IO

MIWUCMPOUT

5

7

11

L1

IO

MIWUCMPINb

68

12

L2

IO

MIWUCMPINa

79

13

L3

IO

MIWU

8

10

14

L4

IO

MIWU

9

11

15

L5

IO

MIWU

10

12

16

L6

IO

MIWU

11

13

17

L7

IO

MIWUMODOUT

12

14

18

G0

IO

INTR

17

25

G1

IO

18

26

G2

IO

19

27

G3

IO

TIO

15

20

28

G4

IO

SO

1

G5

IO

SK

16

2

G6

I

SI

133

G7

I

CKO

2

4

I0

I

7

I1

I

8

I2

I

9

I3

I

10

D0

O

19

D1

O

20

D2

O

21

D3

O

22

VCC

466

GND

13

15

23

CKI

3

5

RESET

14

16

24

Pin Description

VCC and GND are the power supply pins

CKI

is the clock input This can come from an external

source a RC generated oscillator or a crystal (in conjunc-

tion with CKO) See Oscillator description

RESET

is the master reset input See Reset description

PORT I

is a 4-bit Hi-Z input port

PORT L

is an 8-bit IO port

There are two registers associated with the L port a data

register and a configuration register Therefore each L

IO bit can be individually configured under software control

as shown below

Port L

Config

Data

Setup

0

Hi-Z Input (TRI-STATE)

0

1

Input with Weak Pull-up

1

0

Push-pull Zero Output

1

Push-pull One Output

Three data memory address locations are allocated for this

port one each for data register 00D0

configuration regis-

ter 00D1 and the input pins 00D2

Port L has the following alternate features

L0 MIWU or CMPOUT

L1 MIWU or CMPINb

L2 MIWU or CMPINa

L3 MIWU

L4 MIWU (high sink current capability)

L5 MIWU (high sink current capability)

L6 MIWU (high sink current capability)

L7 MIWU or MODOUT (high sink current capability)

The selection of alternate Port L functions is done through

registers WKEN

00C9

to enable MIWU and CNTRL2

00CC to enable comparator and modulator

All eight L-pins have Schmitt Triggers on their inputs

PORT G

is an 8-bit port with 6 IO pins (G0 – G5) and 2 input

pins (G6 G7)

All eight G-pins have Schmitt Triggers on the inputs

There are two registers associated with the G port a data

register and a configuration register Therefore each G port

bit can be individually configured under software control as

shown below

Port G

Config

Data

Setup

0

Hi-Z Input (TRI-STATE)

0

1

Input with Weak Pull-up

1

0

Push-pull Zero Output

1

Push-pull One Output

Three data memory address locations are allocated for this

port one for data register 00D3 one for configuration reg-

ister 00D5 and one for the input pins 00D6

Since G6

and G7 are Hi-Z input only pins any attempt by the user to

configure them as outputs by writing a one to the configura-

tion register will be disregarded Reading the G6 and G7

configuration bits will return zeros Note that the device will

be placed in the Halt mode by writing a ‘‘1’’ to the G7 data

bit

Six pins of Port G have alternate features

G0 INTR (an external interrupt)

G3 TIO (timercounter inputoutput)

G4 SO (MICROWIRE serial data output)

G5 SK (MICROWIRE clock IO)

G6 SI (MICROWIRE serial data input)

G7 CKO crystal oscillator output (selected by mask option)

or HALT restart inputgeneral purpose input (if clock

option is RC or external clock)

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COP820CJ Datasheet(PDF) 6 Page - National Semiconductor (TI)

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