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參數(shù)資料
| 型號(hào)： | CMP82C55AZ |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 20/26頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PROG PERIPHERAL INTFC 40-PDIP |
| 標(biāo)準(zhǔn)包裝： | 99 |
| 接口： | 總線 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 40-DIP |
| 包裝： | 管件 |
| 安裝類型： | 通孔 |
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3
FN6140.2
June 15, 2006
Functional Diagram
Pin Description
SYMBOL
TYPE
DESCRIPTION
VCC
VCC: The +5V power supply pin. A 0.1F capacitor between VCC and GND is recommended for decoupling.
GND
GROUND
D0-D7
I/O
DATA BUS: The Data Bus lines are bidirectional three-state pins connected to the system data bus.
RESET
I
RESET: A high on this input clears the control register and all ports (A, B, C) are set to the input mode.
CS
I
CHIP SELECT: Chip select is an active low input used to enable the 82C55A onto the Data Bus for CPU
communications.
RD
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
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
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
I/O
PORT A: 8-bit input and output port.
PB0-PB7
I/O
PORT B: 8-bit input and output port.
PC0-PC7
I/O
PORT C: 8-bit input and output 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
BIDIRECTIONAL
DATA BUS
I/O
PA7-PA0
I/O
PC7-PC4
I/O
PC3-PC0
I/O
PB7-PB0
8-BIT
INTERNAL
DATA BUS
FIGURE 1. FUNCTIONAL DIAGRAM
MS82C55A, MQ82C55A, MP82C55A
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