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参数资料
| 型号： | MSM82C55A-2 |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | CMOS Programmable Peripheral Interface(CMOS 可编程外围接口) |
| 中文描述： | CMOS可编程外围接口（的CMOS可编程外围接口） |
| 文件页数： | 9/26页 |
| 文件大小： | 189K |
| 代理商： | MSM82C55A-2 |
9/26
Semiconductor
MSM82C55A-2RS/GS/VJS
PIN DESCRIPTION
D
7
- D
0
Item
Bidirectional
Data Bus
Input and
Output
Pin No.
Input/Output
Function
CS
Chip Select
Input
Input
RD
Read Input
Input
A
0
, A
1
Port Select Input
(Address)
Input
PA
7
- PA
0
Port A
Input and
Output
PC
7
- PC
0
Port C
Input and
Output
These are three-state 8-bit bidirectional buses used to write and
read data upon receipt of the
WR
and
RD
signals from CPU and also
used when control words and bit set/reset data are transferred from
CPU to MSM82C55A-2.
RESET
Reset Input
Input
This signal is used to reset the control register and all internal
registers when it is in high level. At this time, ports are all made into
the input mode (high impedance status).
all port latches are cleared to 0.
and all ports groups are set to mode 0.
When the
CS
is in low level, data transmission is enabled with CPU.
When it is in high level, the data bus is made into the high impedance
status where no write nor read operation is performed. Internal
registers hold their previous status, however.
When
RD
is in low level, data is transferred from MSM82C55A-2 to
CPU.
By combination of A
0
and A
1
, either one is selected from among
port A, port B, port C, and control register. These pins are usually
connected to low order 2 bits of the address bus.
These are universal 8-bit I/O ports. The direction of inputs/ outputs
can be determined by writing a control word. Especially, port A can
be used as a bidirectional port when it is set to mode 2.
These are universal 8-bit I/O ports. The direction of inputs/outputs
can be determined by writing a control word as 2 ports with 4 bits
each. When port A or port B is used in mode 1 or mode 2 (port A
only), they become control pins. Especially, when port C is used as
an output port, each bit can set/reset independently.
GND
–
–
GND
WR
Write Input
Input
When
WR
is in low level, data or control words are transferred from
CPU to MSM82C55A-2.
PB
7
- PB
0
Port B
Input and
Output
These are universal 8-bit I/O ports. The direction of inputs/outputs
ports can be determined by writing a control word.
V
CC
–
–
+5V power supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MSM82C55A-2G3-2K | 制造商:OKI Semiconductor 功能描述:MSM82C55A-2G3-2K CPU I/O EOL211209 |
| MSM82C55A-2GS | 制造商:OKI 制造商全称:OKI electronic componets 功能描述:CMOS PROGRAMMABLE PERIPHERAL INTERFACE |
| MSM82C55A-2GS-2K | 制造商:ROHM Semiconductor 功能描述: 制造商:ROHM Semiconductor 功能描述:CMOS PROGRAMMABLE PERIPHERAL INTERFACE |
| MSM82C55A-2R3 | 制造商:OKI Semiconductor 功能描述:CPU I/O EOL211209 制造商:ROHM Semiconductor 功能描述: |
| MSM82C55A-2RS | 制造商:ROHM Semiconductor 功能描述: 制造商:OKI Semiconductor 功能描述:PERIPHERAL INTERFACE, 40 Pin, Plastic, DIP 制造商:ROHM Semiconductor 功能描述:CMOS PROGRAMMABLE PERIPHERAL INTERFACE |
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