ST7538
Table 6. Control Register Functions
(continued)
Function
Value
Selection
Bit 13
12 to 13
Detection
Method
Carrier detection
without conditioning
0
Bit 12
0
Carrier Detection
Notification on CD_PD Line
CLR/T and RxD signal
always Present
CLR/T and RxD lines are
forced to 鈥?鈥?when Carrier
is not detected
Preamble Detection
Notification on CD_PD Line
CLR/T and RxD signal
always Present
Preamble Detection
Notification on CD_PD Line
CLR/T and RxD lines are
forced to 鈥?鈥?when
Preamble has not been
detected or PLL is in
Unlock condition
Preamble
detection
without
conditioning
Note
Default
Carrier detection
with conditioning
Preamble detection
without conditioning
0
1
1
0
Preamble detection
with conditioning
1
1
Bit 14
14
Mains
Interfacing
Mode
Synchronous
Asynchronous
Bit 16
15 to 16
Output Clock
16 MHz
8 MHz
4 MHz
Not Used
0
0
1
1
Bit 18
17 to 18
Packet Mode
Baud Rate
Mclk/32
Mclk/64
Mclk/128
Mclk/256
0
0
1
1
Bit 20
19 to 20
Packet Length
8 Bit
9 Bit
14 Bit
16 Bit
0
0
1
1
Bit 21
21
Packet Mode
Enable
Disabled
Enabled
0
1
Bit 22
22
Sensitivity
Mode
Normal Sensitivity
High Sensitivity
0
1
Bit 23
23
Input Filter
Disabled
Enabled
0
1
Disabled
Normal
Disabled
0
1
Bit 15
0
1
0
1
Bit 17
0
1
0
1
Bit 19
0
1
0
1
14 bits
MLCK/64
4 MHz
Asynchronous
23/30