KK82C55 데이터 시트보기 (PDF) - Kodenshi Auk Co., LTD
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KK82C55 Datasheet PDF : 22 Pages
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KK82C55A
Operating Modes
MODE 1 (Strobed Input/Output). This functional configuration provides a means for transferring I/O data to or from
a specified port in conjunction with strobes or “handshaking” signals. In mode 1, Port A and Port B use the lines on
Port C to generate or accept these “handshaking” signals.
Mode 1 Basic functional Definitions:
• Two Groups (Group A and Group B).
• Each group contains one 8-bit data port and one 4-bit control/data port.
• The 8-bit data port can be either input or output
• Both inputs and outputs are latched.
• The 4-bit port is used for control and status of the
• 8-bit data port.
Input Control Signal Definition
STB (Strobe Input). A “low” on this input loads data into the input latch.
IBF (Input Buffer Full F/F)
A “high” on this output indicates that the data has been loaded into the input latch; in essence, an acknowledgement.
IBF is set by STB input being low and is reset by the rising edge of the RD input.
INTR (Interrupt Request)
A “high” on this output can be used to interrupt the CPU when an input device is requesting service. INTR is set by the
STB is a “one”, IBF is a “one” and INTE is a “one”. It is reset by the falling edge of RD . This procedure allows an
input device to request service from the CPU by simply strobing its data into the port.
INTE A
Controlled by bit set/reset of PC4.
INTE B
Controlled by bit set/reset of PC2
MODE 1 (PORT A)
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1 0 1 1 1/0 X X X
PC6,7
1 = INPUT
0 = OUTPUT
RD
PA7-PA0
INTE
A
PC4
PC5
8
STBA
IBFA
PC3
PC6,7
INTRA
2
MODE 1 (PORT B)
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1 XXXX 1 1 X
PB7-PB0
INTE
B
PC2
PC1
8
STBB
IBFB
RD
PC0
INTRB
Figure 8. MODE 1 Input
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