KK82C55 데이터 시트보기 (PDF) - Kodenshi Auk Co., LTD
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KK82C55 Datasheet PDF : 22 Pages
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KK82C55A
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 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 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 “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 18.
Current Drive Capability
Any output on Port A, B or C can sink or source 2.5mA. This feature allows the KK82C55AN to directly drive
Darlington type drivers and high-voltage displays that require such sink or source current.
Reading Port C Status
In Mode 0, Port C transfers data to or from the peripheral device. When the KK82C55AN is programmed to function in
Modes 1 or 2, Port C generates or accepts “hand-shaking” signals with the peripheral device. Reading the contents of
Port C allows the programmer to test or verify the “status” of each peripheral device and change the program flow
accordingly.
There is no special instruction to read the status information from Port C. A normal read operation of Port C is executed
to perform this function.
INPUT CONFIGURATION
D7 D6
D5
D4
D3
D2
D1
D0
I/O I/O IBFA INTEA INTRA INTEB IBFB INTRB
GROUP A
GROUP B
D7
OBFA
OUTPUT CONFIGURATION
D6
D5
D4
D3
D2
D1
D0
INTEA I/O I/O INTRA INTEB OBFB INTRB
GROUP A
GROUP B
Figure 17a. MODE 1 Status Word Format
D7
OBFA
D6
D5
D4
INTE1 IBFA INTE2
GROUP A
D3
INTRA
(Defined by mode 0 or mode 1 selektion)
D2
D1
D0
GROUP B
Figure 17b. MODE 2 Status Word Format
17
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