CS82C55A datasheet(9/29 Pages) INTERSIL

No. de pieza	CS82C55A

Descripción Electrónicos	CMOS Programmable Peripheral Interface

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Fabricante Electrónico	INTERSIL [Intersil Corporation]

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9

FN2969.10

November 16, 2006

Operating Modes

Mode 1 - (Strobed Input/Output). This functional

configuration provides a means for transferring I/O data to or

from a specified port in conjunction with strobes or “hand

shaking” signals. In mode 1, port A and port B use the lines

on port C to generate or accept these “hand shaking”

signals.

Mode 1 Basic Function Definitions:

• Two Groups (Group A and Group B)

• Each group contains one 8-bit port and one 4-bit

control/data port

• The 8-bit data port can be either input or output. Both

inputs and outputs are latched.

• The 4-bit port is used for control and status of the 8-bit port.

Input Control Signal Definition

(Figures 6 and 7)

STB (Strobe Input)

A “low” on this input loads data into the input latch.

IBF (Input Buffer Full F/F)

A “high” on this output indicates that the data has been

loaded into the input latch: in essence, an acknowledgment.

IBF is set by STB input being low and is reset by the rising

edge of the RD input.

CONTROL WORD #12

CONTROL WORD #14

CONTROL WORD #13

CONTROL WORD #15

Mode 0 Configurations (Continued)

1

D7

0

D6

0

D5

1

D4

1

D3

0

D2

0

D1

0

D0

8

PA7 - PA0

4

PC7 - PC4

4

PC3 - PC0

8

PB7 - PB0

D7 - D0

82C55A

A

B

C

1

D7

0

D6

0

D5

1

D4

1

D3

0

D2

1

D1

0

D0

8

PA7 - PA0

4

PC7 - PC4

4

PC3 - PC0

8

PB7 - PB0

D7 - D0

82C55A

A

B

C

1

D7

0

D6

0

D5

1

D4

1

D3

0

D2

0

D1

1

D0

8

PA7 - PA0

4

PC7 - PC4

4

PC3 - PC0

8

PB7 - PB0

D7 - D0

82C55A

A

B

C

1

D7

0

D6

0

D5

1

D4

1

D3

0

D2

1

D1

1

D0

8

PA7 - PA0

4

PC7 - PC4

4

PC3 - PC0

8

PB7 - PB0

D7 - D0

82C55A

A

B

C

FIGURE 6. MODE 1 INPUT

1

D7

0

D6

1

D5

1

D4

1/0

D3 D2 D1 D0

CONTROL WORD

MODE 1 (PORT A)

PC4

8

IBFA

PC5

INTE

A

PA7-PA0

STBA

INTRA

PC3

PC6, PC7

I/O

2

RD

PC6, PC7

1 = INPUT

0 = OUTPUT

1

D7 D6 D5 D4 D3 D2 D1 D0

CONTROL WORD

MODE 1 (PORT B)

PC2

8

IBFB

PC1

INTE

B

PB7-PB0

STBB

INTRB

PC0

RD

11

82C55A

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