CDP1878C View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

CDP1878C

CMOS Dual Counter-Timer

Intersil 

CDP1878C

REGISTER TRUTH TABLE

ADDRESS

A2

A1

A0

1

1

0

1

1

0

0

1

0

0

1

0

1

0

0

1

1

1

1

1

1

0

1

1

0

1

1

1

0

1

1

0

0

1

0

1

0

0

0

0

0

1

ACTIVE

TPB/WR

RD

X

X

X

X

X

X

X

X

X

X

X

X

REGISTER COUNTER

Write Counter A MSB

Read Counter A MSB

Write Counter A LSB

Read Counter A LSB

Control Register A

Write Counter B MSB

Read Counter B MSB

Write Counter B LSB

Read Counter B LSB

Control Register B

Interrupt Status Register

Not Used

Not Used

Programming Model

BUS 7

BUS 0

CONTROL REGISTER

WRITE ONLY

HOLDING REGISTER LSB

READ ONLY

HOLDING REGISTER MSB

JAM REGISTER LSB

WRITE ONLY

JAM REGISTER MSB

BUS 7

BUS 0

CONTROL REGISTER

WRITE ONLY

HOLDING REGISTER LSB

READ ONLY

HOLDING REGISTER MSB

JAM REGISTER LSB

WRITE ONLY

JAM REGISTER MSB

COUNTER A REGISTERS

COUNTER B REGISTERS

BUS 7

BUS 0

XX 0 0 0 0 0 0

READ ONLY

TIMER A

TIMER B

INTERRUPT STATUS REGISTER

4-94

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