STV82X6 datasheet(39/95 Pages) STMICROELECTRONICS

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STV82x6

9.4

Clocking

A low-jitter PLL Clock is integrated and can be fully reprogrammed using the registers described

below. By default, the programming is defined for a 27-MHz quartz crystal frequency, which is the

frequency recommended for reducing potential RF interference in the application. (See Section

2.2: System Clock.) However, if necessary, the PLL Clock can be re-programmed for other quartz

crystal frequencies within a range from 23 to 30 MHz. Other quartz crystal frequencies can be

programmed on your demand.

Note:

A Crystal Frequency change is compatible with other default I²C programming including the built-in

Automatic Standard Recognition System.

PLL_DIV

PLL Frequency Divider Register

Bit Name

Reset

Function

HPD_IN

Headphone Input Pin Status

Read only I²C bit that displays the HPD pin Status

0: Headphone is detected

1: Headphone is not detected

HPD_ON

Headphone Detection Enable

0: Headphone Detection is disabled

1: Headphone Detection is enabled. If the HPD_IN bit is set, the Loudspeaker and Subwoofer

mute is activated

SW_ON

Subwoofer Enable

Before switching on/off the subwoofer, a mute is recommended to prevent an audible plop.

0: Subwoofer is disabled. Headphone output is selected.

1: Subwoofer is enabled. Subwoofer output is selected and Headphone output is in Mono mode

Bits[4:3]

Reserved.

MUTE_LS

MUTE_SW

MUTE_HP

000

000: LS + SW + HP mono

100: Not used.

001: LS + SW

101: Not used.

010: LS + HP stereo

110: HP stereo only.

011: LS only

111: All muted (Default)

Address (hex): 08h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SDIV[2:0]

FDIV[2:0]

Bit Name

Reset

Function

Bits[7:6]

Reserved.

SDIV[2:0]

000

PLL Frequency S-Divider

FDIV[2:0

101

PLL Frequency F-Divider

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