參數(shù)資料
型號: MC145574
廠商: Motorola, Inc.
英文描述: ISDN S/T-Interface Transceiver
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù): 43/164頁
文件大?。?/td> 1072K
代理商: MC145574
MC145574
5–5
MOTOROLA
When SCPEN comes low again, the next eight rising edges of SCPCLK shift data in from
SCP Rx. This data is then stored in the selected byte. Figure 5–6 illustrates this process.
Figure 5–6. Serial Control Byte Register Write Operation Double 8–Bit Transaction
R/W
A1
A2
A0
D2
D1
D0
HIGH IMPEDANCE
D7
D6
D5
D4
D3
A3
SCPEN
SCPCLK
SCP Tx
SCP Rx
DONT CARE
DONT CARE
DONT CARE
Merged operations are accomplished by not taking SCPEN high between separate SCP instructions.
The SCP bytes/nibbles are strung together in a continuous bit stream and can be a mux or read/write
command. The device is able to extract the separate instructions and provide the appropriate response.
The SCPEN signal goes low at the start of the bit stream and goes high again at the end.
Figure 5–7 illustrates this process with two consecutive nibble register read operations. The merged
instructions can be a free mix of nibble/byte/read/write operations.
Figure 5–7. Merged Serial Control Port Nibble Register Read Operation
SCPEN
R/W
A1
A2
A0
D3
D2
D0
D1
HIGH IMPEDANCE
SCPCLK
SCP Tx
SCP Rx
NOTES:
1. R/W = 1 for a read operation.
2. Data is shifted out on SCP Tx on the falling edges of SCPCLK, MSB first.
3. Data is shifted into the chip from SCP Rx on the rising edges of SCPCLK, MSB first.
DONT CARE
A2
R/W
A1
D3
D2
D0
D1
DONT CARE
HIGH
IMPEDANCE
HIGH
IMPEDANCE
A0
DONT CARE
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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