User's Manual

Table 5-3. DIO Port Configurations/Per Group
ININININ1559B1111
OUTINININ1549A0111
ININOUTIN153991011
OUTINOUTIN152980011
INOUTININ147931101
OUTOUTININ146920101
INOUTOUTIN145911001
OUTOUTOUTIN144900001
INININOUT1398B1110
OUTININOUT1388A0110
ININOUTOUT137891010
OUTINOUTOUT136880010
INOUTINOUT131831100
OUTOUTINOUT130820100
INOUTOUTOUT129811000
OUTOUTOUTOUT128800000
CLCUBADecHexD0D1D3D4
ValuesProgramming Codes
Notes: ‘CU’ is PORT C upper nibble, ‘CL’ is PORT C lower nibble.
5.4.2 Group 1 8255 Configuration & Data
GROUP 1, PORT A DATA
BADR3 + 4
READ/WRITE
D0D1D2D3D4D5D6D7
01234567
GROUP 1, PORT B DATA
BADR3 + 5
READ/WRITE
D0D1D2D3D4D5D6D7
01234567
GROUP 1, PORT C DATA
BADR3 + 6
READ/WRITE
CL1CL2CL3CL4CH1CH2CH3CH4
C1C2C3C4C5C6C7C8
01234567
13