HS1-82C55ARH-8 Intersil, HS1-82C55ARH-8 Datasheet - Page 15

• Manufacturer Part Number: HS1-82C55ARH-8
• Manufacturer: Intersil

Specifications of HS1-82C55ARH-8

• Operating Temperature (max): 125C
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Compliant

Special Mode Combination Considerations
There are several combinations of modes possible. For any
combination, some or all of 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 25.
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 programmed as an output in a Mode 1
group or to change an interrupt enable flag, the “Set/Reset
Port C Bit” command must be used.
With a “Set/Reset Port C Bit” command, any Port C line
programmed as an output (including 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 fare not affected by a “Set/
Reset Port C Bit” command. Writing to the corresponding
Port C bit positions of the ACK and STB lines with the “Set/
Reset Port C Bit” command will affect the Group A and
Group B interrupt enable flags, as illustrated in Figure 25.
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PA0
AP1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
IN
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
15
MODE 0
OUT
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
MODE DEFINITION SUMMARY
HS-82C55ARH
INTR B
INTR A
STB B
STB A
IBF B
IBF A
I/O
I/O
IN
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
NOTE: (Defined by Mode 0 or Mode 1 Selection)
OBFA INTEA
OBFA
MODE 1
D7
I/O
D7
D7
FIGURE 23. MODE 1 STATUS WORD FORMAT
FIGURE 24. MODE 2 STATUS WORD FORMAT
I/O
INTE1
D6
D6
D6
INTR B
INTR A
OBF B
ACK B
ACK A
OBF A
OUT
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
GROUP A
GROUP A
I/O
I/O
IBFA
GROUP A
D5
D5
I/O
OUTPUT CONFIGURATION
IBFA
D5
INPUT CONFIGURATION
INTEA
D4
D4
I/O
INTE2
D4
GROUP A ONLY
INTRA
INTRA
MODE 2
INTR A
D3
D3
ACK A
OBF A
STB A
IBF A
INTRA
I/O
I/O
I/O
-
-
-
-
-
-
-
-
D3
INTEB
INTEB OBFB INTRB
D2
D2
D2
X
GROUP B
GROUP B
GROUP B
IBFB
D1
D1
Mode 0 or
Mode 1 Only
D1
X
INTRB
D0
D0
D0
X