CP82C54-12 datasheet(8/22 Pages) INTERSIL

Part #	CP82C54-12

Description	CMOS Programmable Intervel Timer

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Manufacturer	INTERSIL [Intersil Corporation]

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8

82C54

Since the Control Word Register and the three Counters have

separate addresses (selected by the A1, A0 inputs), and each

Control Word specifies the Counter it applies to (SC0, SC1

bits), no special instruction sequence is required. Any

programming sequence that follows the conventions above is

acceptable.

CONTROL WORD FORMAT

A1, A0 = 11; CS = 0; RD = 1; WR = 0

D7

D6

D5

D4

D3

D2

D1

D0

SC1

SC0

RW1

RW0

M2

M1

M0

BCD

SC - SELECT COUNTER

SC1

SC0

0

Select Counter 0

0

1

Select Counter 1

1

0

Select Counter 2

1

Read-Back Command (See Read Operations)

RW - READ/WRITE

RW1 RW0

0

Counter Latch Command (See Read Operations)

0

1

Read/Write least significant byte only.

1

0

Read/Write most significant byte only.

1

Read/Write least significant byte first, then most

significant byte.

M - MODE

M2

M1

M0

0

Mode 0

0

1

Mode 1

X

1

0

Mode 2

X

1

Mode 3

1

0

Mode 4

1

0

1

Mode 5

BCD - BINARY CODED DECIMAL

0

Binary Counter 16-bit

1

Binary Coded Decimal (BCD) Counter (4 Decades)

NOTE:

Don’t Care bits (X) should be 0 to insure compatibility with

future products.

POSSIBLE PROGRAMMING SEQUENCE

A1

A0

Control Word - Counter 0

1

LSB of Count - Counter 0

0

MSB of Count - Counter 0

0

Control Word - Counter 1

1

LSB of Count - Counter 1

0

1

MSB of Count - Counter 1

0

1

Control Word - Counter 2

1

LSB of Count - Counter 2

1

0

MSB of Count - Counter 2

1

0

POSSIBLE PROGRAMMING SEQUENCE

A1

A0

Control Word - Counter 0

1

Control Word - Counter 1

1

Control Word - Counter 2

1

LSB of Count - Counter 2

1

0

LSB of Count - Counter 1

0

1

LSB of Count - Counter 0

0

MSB of Count - Counter 0

0

MSB of Count - Counter 1

0

1

MSB of Count - Counter 2

1

0

POSSIBLE PROGRAMMING SEQUENCE

A1

A0

Control Word - Counter 2

1

Control Word - Counter 1

1

Control Word - Counter 0

1

LSB of Count - Counter 2

1

0

MSB of Count - Counter 2

1

0

LSB of Count - Counter 1

0

1

MSB of Count - Counter 1

0

1

LSB of Count - Counter 0

0

MSB of Count - Counter 0

0

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