8255A-5 Просмотр технического описания (PDF) - Intel

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8255A-5

CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

Intel 

82C55A

231256 – 18

Figure 13 MODE Control Word

231256 – 19

Figure 14 MODE 2

Figure 15 MODE 2 (Bidirectional)

NOTE

Any sequence where WR occurs before ACK and STB occurs before RD is permissible

(INTR e IBF  MASK  STB  RD a OBF  MASK  ACK  WR)

14

231256 – 20

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