CS82C55A-5Z View Datasheet(PDF) - Intersil
Part Name
Description
MFG CO.
'CS82C55A-5Z' PDF : 30 Pages View PDF
82C55A
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
11
1/0 1/0 1/0
PC2-PC0
1 = INPUT
0 = OUTPUT
PORT B
1 = INPUT
0 = OUTPUT
GROUP B MODE
0 = MODE 0
1 = MODE 1
FIGURE 11. MODE CONTROL WORD
PC3
INTRA
PA7-PA0 8
PC7
INTE
1
PC6
OBFA
ACKA
INTE
2
PC4
STBA
PC5
IBFA
WR
RD
PC2-PC0
3
I/O
FIGURE 12. MODE 2
DATA FROM
CPU TO 82C55A
WR
OBF
INTR
ACK
STB
tWOB
tST
tAOB
tAK
IBF
PERIPHERAL
BUS
tSIB
tPS
tPH
tAD
tKD
tRIB
RD
DATA FROM
DATA FROM
PERIPHERAL TO 82C55A
82C55A TO PERIPHERAL
DATA FROM
82C55A TO CPU
NOTE: Any sequence where WR occurs before ACK and STB occurs before RD is permissible. (INTR = IBF MASK STB RD + OBF MASK
ACK WR)
FIGURE 13. MODE 2 (BIDIRECTIONAL)
FN2969 Rev 11.00
Dec 8, 2015
Page 12 of 30
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