Group 0, Port B Data

BADR3 + 1

READ/WRITE

7	6	5	4	3	2	1	0

D7	D6	D5	D4	D3	D2	D1	D0

GROUP 0, PORT C DATA
BADR3 + 2
READ/WRITE
7	6	5	4	3	2	1	0

C8	C7	C6	C5	C4	C3	C2	C1

CH4	CH3	CH2	CH1	CL4	CL3	CL2	CL1

GROUP 0 CONFIGURE
BADR3 + 3
READ/WRITE
7	6	5	4	3	2	1	0

MS	M3	M2	A	CH	M1	B	CL

This register is used to configure the Group 0 ports as either input or output, and configures the operating mode to mode 0, 1 or 2. The following describes configuration for mode 0. See the Intel or Harris 8255 data sheets for information on other modes of operation

8255 MODE 0 CONFIGURATION

1. Output Ports

In mode 0 configuration, 82C55 ports can be configured as outputs, holding the data written to them. For example, to set all three ports (A, B, & C) of Group 0 to output mode, write the value 80 hex to BADR3 + 3 (refer to Table 5-3 below). The user is then able to read the current state of the output port by simply reading the address corresponding to that port.

2. Input Ports

In mode 0 configuration, the 82C55 ports can be configured as inputs, reading the state of the inputs lines. For example, to set all of the ports of Group 0 to the input mode, write the value 9B hex to BADR3 + 3.

PCI-DIO96 specifications

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