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參數(shù)資料
| 型號(hào)： | MD82C55B |
| 廠商： | Harris Corporation |
| 英文描述： | CMOS Programmable Peripheral Interface |
| 中文描述： | CMOS可編程外設(shè)接口 |
| 文件頁數(shù)： | 2/26頁 |
| 文件大?。?/td> | 234K |
| 代理商： | MD82C55B |
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2
Functional Diagram
Pin Description
SYMBOL
PIN
NUMBER
TYPE
DESCRIPTION
V
CC
26
V
CC
: The +5V power supply pin. A 0.1
μ
F capacitor between pins 26 and 7 is
recommended for decoupling.
GND
7
GROUND
D0-D7
27-34
I/O
DATA BUS: The Data Bus lines are bidirectional three-state pins connected to the
system data bus.
RESET
35
I
RESET: A high on this input clears the control register and all ports (A, B, C) are set
to the input mode with the “Bus Hold” circuitry turned on.
CS
6
I
CHIP SELECT: Chip select is an active low input used to enable the 82C55A onto the
Data Bus for CPU communications.
RD
5
I
READ: Read is an active low input control signal used by the CPU to read status
information or data via the data bus.
WR
36
I
WRITE: Write is an active low input control signal used by the CPU to load control
words and data into the 82C55A.
A0-A1
8, 9
I
ADDRESS: These input signals, in conjunction with the RD and WR inputs, control
the selection of one of the three ports or the control word register. A0 and A1 are
normally connected to the least significant bits of the Address Bus A0, A1.
PA0-PA7
1-4, 37-40
I/O
PORT A: 8-bit input and output port. Both bus hold high and bus hold low circuitry are
present on this port.
PB0-PB7
18-25
I/O
PORT B: 8-bit input and output port. Bus hold high circuitry is present on this port.
PC0-PC7
10-17
I/O
PORT C: 8-bit input and output port. Bus hold circuitry is present on this port.
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER
(4)
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
GROUP B
CONTROL
GROUP A
CONTROL
DATA BUS
BUFFER
READ
WRITE
CONTROL
LOGIC
RD
WR
A1
A0
RESET
CS
D7-D0
POWER
SUPPLIES
+5V
GND
BI-DIRECTIONAL
DATA BUS
I/O
PA7-PA0
I/O
PC7-PC4
I/O
PC3-PC0
I/O
PB7-PB0
8-BIT
INTERNAL
DATA BUS
82C55A
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