WS82C55A 데이터 시트보기 (PDF) - Wing Shing International Group

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WS82C55A

CMOS Programmable peripheral Interface

Wing Shing International Group 

Timing Waveforms (Continued)

WR

OBF

tWOB (21)

tAOB (22)

WS82C55A

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 (BI-DIRECTIONAL)

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

MASK • ACK • WR)

20

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