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参数资料
| 型号： | TLC320A545I |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | SMA (F) TO MCX (M) ADAPTERS |
| 中文描述： | 单信道数据/传真编解码器 |
| 文件页数： | 19/35页 |
| 文件大小： | 174K |
| 代理商： | TLC320A545I |
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4–3
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
DT_FS
DT_SCLK
DT_DIN
DT_DOUT
Figure 4–3. FS Low Mode Primary Serial Communication Timing
4.3
Secondary Serial Communication
Secondary serial communication is used to read or write 16-bit words that program both the options and the circuit
configurations of the device. Register programming always occurs during secondary communication. Control
registers 1 and 2 can only be written to or read from the serial port. Two primary and secondary communication cycles
are necessary to program the control registers. If the default value for a particular register is desired, then the register
addressing can be omitted during secondary communications. The NOOP (no operation) command addresses a
pseudo-register, register 0, and no register programming takes place during this secondary communication.
During a secondary communication, a register may be written to or read from. When writing a value to a register, the
DT_DIN line contains the value to be written. The data returned on DT_DOUT is 00h.
The method for requesting a secondary communication is by asserting the least significant bit (D0) of DT_DIN high
as shown in Table 4–1.
Table 4–1. Least-Significant-Bit Control Function
CONTROL BIT D0
CONTROL BIT FUNCTION
0
No secondary communication request
1
Secondary communication request
Figure 4–4 shows the data format XX_DIN and XX_DOUT during secondary communication.
D15–D0
––
––
1
D12
D11
D10
D9
D8
D7–D0
Don’t Care
D15
DT_DIN
(Read)
––
––
0
D12
D11
D10
D9
D8
D7–D0
Register Data
D15
DT_DIN
(Write)
Register Address
R/W
Register Data
D15–D8
D7–D0
AII 0
AII 0
DT_DOUT
(Read)
DT_DOUT
(Write)
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