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82C55A_15

CMOS Programmable Peripheral Interface

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82C55A

Timing Waveforms (Continued)

WR

OBF

tWOB (21)

tAOB (22)

INTR

ACK

OUTPUT

tWIT

(28)

tAK (15)

tWB (12)

FIGURE 28. MODE 1 (STROBED OUTPUT)

tAIT (27)

DATA FROM

CPU TO 82C55A

WR

OBF

INTR

ACK

tWOB

(21)

tAOB

(22)

tAK

(15)

(NOTE)

STB

IBF

PERIPHERAL

BUS

tST

(16)

tSIB

(23)

tPS (17)

(NOTE)

tAD (19)

tKD

(20)

tPH (18)

tRIB (24)

RD

DATA FROM

DATA FROM

PERIPHERAL TO 82C55A

82C55A TO PERIPHERAL

DATA FROM

82C55A TO CPU

FIGURE 29. MODE 2 (BIDIRECTIONAL)

NOTE: Any sequence where WR occurs before ACK and STB occurs before RD is permissible. (INTR = IBF  MASK  STB  RD  OBF  MASK

 ACK  WR)

FN2969 Rev 11.00

Dec 8, 2015

Page 21 of 30

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