82C55A_15 Просмотр технического описания (PDF) - Intersil
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82C55A_15 Datasheet PDF : 30 Pages
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82C55A
Mode 0 Configurations (Continued)
CONTROL WORD #12
D7 D6 D5 D4 D3 D2 D1 D0
10 0 1 1 0 0 0
8
A
82C55A
4
D7 - D0
C
4
8
B
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
CONTROL WORD #14
D7 D6 D5 D4 D3 D2 D1 D0
10 0 1 1 0 1 0
A
82C55A
D7 - D0
C
B
8
PA7 - PA0
4
PC7 - PC4
4
PC3 - PC0
8
PB7 - PB0
CONTROL WORD #13
D7 D6 D5 D4 D3 D2 D1 D0
10 0 1 1 0 0 1
A
82C55A
D7 - D0
C
B
8
PA7 - PA0
4
PC7 - PC4
4
PC3 - PC0
8
PB7 - PB0
CONTROL WORD #15
D7 D6 D5 D4 D3 D2 D1 D0
10 0 1 1 0 1 1
A
82C55A
D7 - D0
C
B
8
PA7 - PA0
4
PC7 - PC4
4
PC3 - PC0
8
PB7 - PB0
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 “hand shaking”
signals. In mode 1, port A and port B use the lines on port C to
generate or accept these “hand shaking” signals.
Mode 1 Basic Function Definitions:
• Two Groups (Group A and Group B)
• Each group contains one 8-bit 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 port.
Input Control Signal Definition
(Figures 6 and 7)
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 acknowledgment. IBF is set
by STB input being low and is reset by the rising edge of the
RD input.
MODE 1 (PORT A)
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1 0 1 1 1/0
PC6, PC7
1 = INPUT
0 = OUTPUT
RD
PA7-PA0
INTE
A
PC4
PC5
8
STBA
IBFA
PC3
PC6, PC7
INTRA
2
I/O
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
11
MODE 1 (PORT B)
PB7-PB0
INTE
B
PC2
PC1
8
STBB
IBFB
PC0
INTRB
RD
FIGURE 6. MODE 1 INPUT
FN2969 Rev 11.00
Dec 8, 2015
Page 9 of 30
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