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82C55 Datasheet(PDF) 16 Page - Intel Corporation

Part # 82C55
Description  CHMOS PROGRAMMABLE PERIPHERAL INTERFACE
PDF  23 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

82C55 Datasheet(HTML) 16 Page - Intel Corporation

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82C55A
Mode Definition Summary
MODE 0
MODE 1
MODE 2
IN
OUT
IN
OUT
GROUP A ONLY
PA0
IN
OUT
IN
OUT
PA1
IN
OUT
IN
OUT
PA2
IN
OUT
IN
OUT
PA3
IN
OUT
IN
OUT
PA4
IN
OUT
IN
OUT
PA5
IN
OUT
IN
OUT
PA6
IN
OUT
IN
OUT
PA7
IN
OUT
IN
OUT
PB0
IN
OUT
IN
OUT
PB1
IN
OUT
IN
OUT
PB2
IN
OUT
IN
OUT
PB3
IN
OUT
IN
OUT
MODE 0
PB4
IN
OUT
IN
OUT
OR MODE 1
PB5
IN
OUT
IN
OUT
ONLY
PB6
IN
OUT
IN
OUT
PB7
IN
OUT
IN
OUT
PC0
IN
OUT
INTRB INTRB
IO
PC1
IN
OUT
IBFB
OBFB
IO
PC2
IN
OUT
STBB
ACKB
IO
PC3
IN
OUT
INTRA INTRA
INTRA
PC4
IN
OUT
STBA
IO
STBA
PC5
IN
OUT
IBFA
IO
IBFA
PC6
IN
OUT
IO
ACKA
ACKA
PC7
IN
OUT
IO
OBFA
OBFA
Special Mode Combination Considerations
There are several combinations of modes possible
For any combination some or all of the Port C lines
are used for control or status The remaining bits are
either inputs or outputs as defined by a ‘‘Set Mode’’
command
During a read of Port C the state of all the Port C
lines except the ACK and STB lines will be placed
on the data bus In place of the ACK and STB line
states flag status will appear on the data bus in the
PC2 PC4 and PC6 bit positions as illustrated by
Figure 18
Through a ‘‘Write Port C’’ command only the Port C
pins programmed as outputs in a Mode 0 group can
be written No other pins can be affected by a ‘‘Write
Port C’’ command nor can the interrupt enable flags
be accessed To write to any Port C output pro-
grammed as an output in a Mode 1 group or to
change an interrupt enable flag the ‘‘SetReset Port
C Bit’’ command must be used
With a ‘‘SetReset Port C Bit’’ command any Port C
line programmed as an output (including INTR IBF
and OBF) can be written or an interrupt enable flag
can be either set or reset Port C lines programmed
as inputs including ACK and STB lines associated
with Port C are not affected by a ‘‘SetReset Port C
Bit’’ command Writing to the corresponding Port C
bit positions of the ACK and STB lines with the
‘‘SetReset Port C Bit’’ command will affect the
Group A and Group B interrupt enable flags as illus-
trated in Figure 18
Current Drive Capability
Any output on Port A B or C can sink or source 25
mA This feature allows the 82C55A to directly drive
Darlington type drivers and high-voltage displays
that require such sink or source current
16



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