CMS82C55AZ datasheet(5/26 Pages) INTERSIL

Part #	CMS82C55AZ

Description	CMOS Programmable Peripheral Interface

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Manufacturer	INTERSIL [Intersil Corporation]

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5

FN6140.2

June 15, 2006

Operational Description

Mode Selection

There are three basic modes of operation than can be

selected by the system software:

Mode 0 - Basic Input/Output

Mode 1 - Strobed Input/Output

Mode 2 - Bidirectional Bus

When the reset input goes “high”, all ports will be set to the

input mode. After the reset is removed, the 82C55A can

remain in the input mode with no additional initialization

required. The control word register will contain 9Bh. During

the execution of the system program, any of the other modes

may be selected using a single output instruction. This

allows a single 82C55A to service a variety of peripheral

devices with a simple software maintenance routine. Any

port programmed as an output port is initialized to all zeros

when the control word is written.

The modes for Port A and Port B can be separately defined,

while Port C is divided into two portions as required by the

Port A and Port B definitions. All of the output registers,

including the status flip-flops, will be reset whenever the

mode is changed. Modes may be combined so that their

functional definition can be “tailored” to almost any I/O

structure. For instance: Group B can be programmed in

Mode 0 to monitor simple switch closings or display

computational results, Group A could be programmed in

Mode 1 to monitor a keyboard or tape reader on an interrupt-

driven basis.

The mode definitions and possible mode combinations may

seem confusing at first, but after a cursory review of the

complete device operation a simple, logical I/O approach will

surface. The design of the 82C55A has taken into account

things such as efficient PC board layout, control signal definition

vs. PC layout and complete functional flexibility to support

almost any peripheral device with no external logic. Such

design represents the maximum use of the available pins.

Single Bit Set/Reset Feature (Figure 5)

Any of the eight bits of Port C can be Set or Reset using a

single Output instruction. This feature reduces software

requirements in control-based applications.

When Port C is being used as status/control for Port A or B,

these bits can be set or reset by using the Bit Set/Reset

operation just as if they were output ports.

FIGURE 3. BASIC MODE DEFINITIONS AND BUS INTERFACE

DATA BUS

8I/O

B

PB7-PB0

4I/O

PC3-PC0

4I/O

C

PC7-PC4

8I/O

A

PA7-PA0

CONTROL BUS

ADDRESS BUS

RD, WR

82C55A

D7-D0

A0-A1

CS

MODE 0

8I/O

B

PB7-PB0

CONTROL

C

8I/O

A

PA7-PA0

MODE 1

OR I/O

CONTROL

OR I/O

8I/O

B

PB7-PB0

C

BI-

A

PA7-PA0

MODE 2

CONTROL

DIRECTIONAL

FIGURE 4. MODE DEFINITION FORMAT

D7 D6 D5

D4 D3 D2 D1 D0

PORT C (LOWER)

1 = INPUT

0 = OUTPUT

PORT B

1 = INPUT

0 = OUTPUT

MODE SELECTION

0 = MODE 0

1 = MODE 1

GROUP B

PORT C (UPPER)

1 = INPUT

0 = OUTPUT

PORT A

1 = INPUT

0 = OUTPUT

MODE SELECTION

00 = MODE 0

01 = MODE 1

GROUP A

1X = MODE 2

MODE SET FLAG

1 = ACTIVE

CONTROL WORD

MS82C55A, MQ82C55A, MP82C55A

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