參數(shù)資料
型號(hào)： 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)： 42/164頁
文件大?。?/td> 1072K
代理商： MC145574
MC145574
5–4
MOTOROLA
Figure 5–4. Serial Control Port Byte Register Read 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
HIGH
IMPEDANCE
A byte register write is also a 16–bit SCP transaction. Figure 5–5 illustrates this process. To initiate
an SCP byte register write, the SCPEN must be brought low. As before, the next bit determines whether
the operation is to be read or write. If the first bit is a 0, then a write operation is selected. Again the
next three bits read in from SCP Rx on the subsequent three rising edges of SCPCLK must all be
1 in order to select the pointer nibble register (NR7). The following four bits shifted in are automatically
written into NR7. As in an SCP byte register read, these bits are the address bits for the selected
byte register operation. The next eight rising edges of SCPCLK shift in the data from the SCP Rx.
This data is then stored in the selected byte register. Throughout this operation SCP Tx is in a high–im-
pedance state. Note that if the selected byte is “read only”, then this operation has no effect.
Figure 5–5. Serial Control Port Byte Register Write Operation
SCPEN
SCPCLK
SCP Tx
SCP Rx
R/W
A1
A2
A0
D2
D1
D0
HIGH IMPEDANCE
D7
D6
D5
D4
D3
A3
DONT CARE
DONT CARE
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.
As mentioned previously, an SCP byte access is a 16–bit transaction. This can take place in one 16–bit
exchange or two 8–bit exchanges. If the transaction is performed in two 8–bit exchanges, then SCPEN
should be returned high after the first eight bits have been shifted into the part.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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MC145574AEG 制造商:Freescale Semiconductor 功能描述:
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