ST7538Q datasheet(33/44 Pages) STMICROELECTRONICS

33 / 44 page

ST7538Q

Functional description

33/44

Function

Value

Selection

Note

Default

Bit 13

Bit 12

12 to

Detection

Method(1)

Carrier detection

without

conditioning

Carrier Detection

Notification on CD_PD

Line

CLR/T and RxD signal

always Present

Preamble

detection

without

conditioning

Carrier detection

with conditioning

CLR/T and RxD lines

are forced to “0” when

Carrier is not detected

Preamble

detection

without

conditioning

Preamble Detection

Notification on CD_PD

Line

CLR/T and RxD signal

always Present

Preamble

detection

with conditioning

Preamble Detection

Notification on CD_PD

Line

CLR/T and RxD lines

are forced to “0” when

Preamble has not been

detected or PLL is in

Unlock condition

Bit 14

Mains

Interfacing

Mode

Synchronous

Asynchronous

Asynchronou

Bit 16

Bit 15

15 to

Output Clock

16 MHz

8 MHz

4 MHz

Clock OFF

4 MHz

Bit 17

Active only if Extended

Control Register is

enable (Bit 21=”1”)

Output

Voltage Level

Freeze

Enabled

Disabled

Bit 18

Active only if Extended

Control Register is

enable (Bit 21=”1”)

Header

Recognition

Disabled

Enabled

Disabled

Bit 19

Active only if Header

Recognition Function

(Bit 18=”1”) and

Extended Control

are enable

Frame

Length Count

Disabled

Enabled

Disabled

Table 11. Control register functions (continued)

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