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WS82C55A 参数 Datasheet PDF下载

WS82C55A图片预览
型号: WS82C55A
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS可编程外设接口 [CMOS Programmable peripheral Interface]
分类和应用:
文件页数/大小: 25 页 / 557 K
品牌: Wing Shing [ WING SHING COMPUTER COMPONENTS ]
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WS82C55A  
Pin Description  
( For DIP-40)  
PIN  
NUMBER  
SYMBOL  
TYPE  
DESCRIPTION  
: The +5V power supply pin. A 0.1µF capacitor between pins 26 and 7 is  
V
26  
V
CC  
CC  
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  
CS  
35  
6
I
I
I
I
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.  
CHIP SELECT: Chip select is an active low input used to enable the 82C55A onto the  
Data Bus for CPU communications.  
RD  
5
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  
8, 9  
WRITE: Write is an active low input control signal used by the CPU to load control  
words and data into the 82C55A.  
A0-A1  
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  
PC0-PC7  
18-25  
10-17  
I/O  
I/O  
PORT B: 8-bit input and output port. Bus hold high circuitry is present on this port.  
PORT C: 8-bit input and output port. Bus hold circuitry is present on this port.  
Functional Diagram  
I/O  
PA7-PA0  
+5V  
GROUP A  
PORT A  
(8)  
POWER  
SUPPLIES  
GND  
GROUP A  
CONTROL  
GROUP A  
PORT C  
UPPER  
(4)  
I/O  
PC7-PC4  
BI-DIRECTIONAL  
DATA BUS  
DATA BUS  
BUFFER  
D7-D0  
GROUP B  
PORT C  
LOWER  
(4)  
8-BIT  
INTERNAL  
DATA BUS  
I/O  
PC3-PC0  
RD  
WR  
A1  
READ  
WRITE  
CONTROL  
LOGIC  
GROUP B  
CONTROL  
GROUP B  
PORT B  
(8)  
I/O  
PB7-PB0  
A0  
RESET  
CS  
2