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HS-82C55ARH

Radiation Hardened CMOS Programmable Peripheral Interface

Intersil 

HS-82C55ARH

Operating Modes

Mode 0 (Basic Input/Output)

This functional configuration provides simple input and

output operations for each of the three ports. No

handshaking it required, data is simply written to or read

from a specific port.

Mode 0 Basic Functional Definitions:

• Two 8-bit ports and two 4-bit ports

• Any port can be input or output

• Outputs are latched

• Inputs are not latched

• 16 different Input/Output configurations possible

RD

INPUT

CS, A1, A0

D7 - D0

WR

D7 - D0

CS, A1, A0

OUTPUT

TPVRL

TAVRL

TRLRH

TRHPX

TRHAX

TRLDV

FIGURE 13. MODE 0 (BASIC INPUT)

TRHDX

TAVWL

TWLWH

TDVWH

TWHDX

TWHAX

TWHPV

FIGURE 14. MODE 0 (BASIC OUTPUT)

9

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