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參數(shù)資料
| 型號(hào)： | MSM81C55-5GS-2K |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 22 I/O, PIA-GENERAL PURPOSE, PQFP44 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 19/19頁(yè) |
| 文件大?。?/td> | 147K |
| 代理商： | MSM81C55-5GS-2K |
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Semiconductor
MSM81C55-5RS/GS/JS
(2) Method using RESET
VCC
tSU
Standby Mode
tR
5 V
4.5 V
2.2 V
VCCH
GND
RESET
Note: In this case, the C/S register is reset, the port is set into the input mode, and the timer stops.
PIN FUNCTION
RESET
A high level input to this pin resets the chip, places all three I/O ports in the input mode, resets all
output latches and stops timer.
Symbol
Function
AD0 - 7
Three-state, bi-directional address/data bus. Eight-bit address information on this bus is read into
the internal address latch at the negative going edge of the ALE. Eight bits of data can be read from
or written to the chip using this bus depending on the state of the WRITE or READ input.
ALE
Negative going edge of the ALE (Address Latch Enable) input latches AD0 - 7, IO/M, and CE signals into
the respective latches.
CE
When the CE input is high, both read and write operations to the chip are disabled.
IO/M
A high level input to this pin selects the internal I/O functions, and a low level selects the memory.
RD
If this pin is low, data from either the memory or ports is read onto the AD0 - 7 lines depending on
the state of the IO/M line.
TIMER OUT
Timer output. When the present count is reached during timer operation, this pin provides
a square-wave or pulse output depending on the programmed control status.
WR
If this pin is low, data on lines AD0 - 7 is written into either the memory or into the selected port
depending on the state of the line IO/M line.
PA0 - 7
(PB0 - 7)
General-purpose I/O pins. Input/output directions can be determined by programming the command/
status (C/S) register.
PC0 - 5
Three pins are usable either as general-purpose I/O pins or control pins for the PA and PB ports.
When used as control pins, they are assigned to the following functions:
PC0: A INTR (port A interrupt)
PC1: A BF (port A full)
PC2: A STB (port A strobe)
PC3: B INTR (port B interrupt)
PC4: B BF (port B buffer full)
PC5: B STB (port B strobe)
TIMER IN
Input to the counter/timer
VCC
3–6V power supply
GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSM82C51A-2GS-VK | 1 CHANNEL(S), 64K bps, SERIAL COMM CONTROLLER, PDSO32 |
| MSM82C51A-2JS | 1 CHANNEL(S), 64K bps, SERIAL COMM CONTROLLER, PQCC28 |
| MSM82C51A-2GS-K | 1 CHANNEL(S), 64K bps, SERIAL COMM CONTROLLER, PDSO32 |
| MSM82C53-2GS-K | 3 TIMER(S), PROGRAMMABLE TIMER, PDSO32 |
| MSM82C53-2RS | 3 TIMER(S), PROGRAMMABLE TIMER, PDIP24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSM81C55-5JS | 制造商:OKI 制造商全稱(chēng):OKI electronic componets 功能描述:2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER |
| MSM81C55-5RS | 制造商:ROHM Semiconductor 功能描述: 制造商:OK International 功能描述: |
| MSM82C37B-5GS | 制造商:OKI 制造商全稱(chēng):OKI electronic componets 功能描述:PROGRAMMABLE DMA CONTROLLER |
| MSM82C37B-5JS | 制造商:OK International 功能描述:4 CHANNEL(S), 5 MHZ, DMA CONTROLLER, PQCC44 |
| MSM82C37B-5RS | 制造商:OK International 功能描述:4 CHANNEL(S), 5 MHz, DMA CONTROLLER, PDIP40 |
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