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

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8255A-5

CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

Intel 

82C55A

MODE 0 Configurations (Continued)

231256 – 12

Operating Modes

MODE 1 (Strobed Input Output) This functional

configuration provides a means for transferring I O

data to or from a specified port in conjunction with

strobes or ‘‘handshaking’’ signals In mode 1 Port A

and Port B use the lines on Port C to generate or

accept these ‘‘handshaking’’ signals

Mode 1 Basic functional Definitions

 Two Groups (Group A and Group B)

 Each group contains one 8-bit data port and one

4-bit control data port

 The 8-bit data port can be either input or output

Both inputs and outputs are latched

 The 4-bit port is used for control and status of the

8-bit data port

10

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