參數(shù)資料
型號: PSM2000ACD
英文描述: PSM2000ACD Webchip Module(網(wǎng)絡(luò)通信控制器模塊(由PS2000ACQ,RS-232驅(qū)動(dòng)器,RS*485驅(qū)動(dòng)器及嵌入式Modem構(gòu)成))
中文描述: PSM2000ACD Webchip模塊(網(wǎng)絡(luò)通信控制器模塊(由PS2000ACQ和RS - 232驅(qū)動(dòng)器,恏巴* 485驅(qū)動(dòng)器及嵌入式調(diào)制解調(diào)器構(gòu)成))
文件頁數(shù): 11/17頁
文件大?。?/td> 404K
代理商: PSM2000ACD
PSM2000ACD WebChip Module Datasheet
Doc. Number:
INHD002
Version 1.0
8/20/2001
Figure 4 One Communication Process between PSM2000ACD and MCU
The communication timing between the PSM2000ACD and the MCU conforms to
the following rules:
1. First, the PSM2000ACD sends an /INT signal to request a data exchange with
the MCU. The following communication transaction will be controlled by the
MCU; that is, the MCU sends the chip select signal /CS and the clock signal
CLK.
2. Data will be transferred in byte form. The MSB is transferred first until the LSB
is received.
3. Data is sampled on the falling edge of CLK and shifted on the rising edge.
4. When the PSM2000ACD doesn’t exchange data with the MCU, the MCU must
set /CS and CLK high.
The timing of the PSM2000ACD sending data to the MCU is shown in figure 5.
The first byte is the length n of the data packet
The first byte data
The second byte data
The third byte data
PSM2000ACD sends /INT
/CS
CLK
DO
>10
μ
s
/INT recover
<4
μ
s
The nth byte data
The (n+1)th byte data
/INT hold high level
/CS
CLK
DO
PSM2000ACD finish sending data
Figure 5 Timing of PSM2000ACD Sending Data to MCU
The enlarged CLK and DO timing is shown in Figure 6.
P&S DataCom Corporation
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11
of
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