Am8255A Operation Control Word Format; Am8255A Bit Set/Reset Control Word Format - Advanced Micro Computers Am96/4016 User Manual

5-2
TABLE 5-1. Am8255A OPERATION CONTROL WORD FORMAT
' "
Port C. Bits 0-3
1
=
Input
0= Output
Port B
1
=
Input
0= Output
L -
Mode Selection
1
=
Mode
1
C
P~rt=C~;:~-7
1
=
Input
0= Output
PortA
1
=
Input
0= Output
L . -
Mode
()() = Mode 0
01
= Mode
1
1X
=
Mode 2
1
"~
Operation Control Word
TABLE 5-2. Am8255A BIT SET/RESET CONTROL WORD FORMAT
~L
BIT SET'RESET
1 - SET
0- RESET
PORT C BIT SELECT
BIT 03 02 01
o
0 0 0
1 0 0 1
2 0 1 0
3 0 1 1
4 1 0 0
5 1 0 1
6 1 1 0
7 1 1 1
L . -
0 BIT SET/RESET CONTROL WORD