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2004 Jan 26 41
Philips Semiconductors Product specification
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
SAA6752HS
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Table 16 I
2
C-bus clock static/dynamic settings
ADR
HEX
M
COMMAND
NAME
R/W SIZE/POSITION PARAMETER/RANGE DEFAULT DESCRIPTION
30 I clock mode R/W 1 byte mode 1
bit[1:0] = 01 mode 1 mode 1: crystal frequency fixed; SCR
frequency frame locked to V-sync
bit[1:0] = 10 mode 2 mode 2: crystal frequency frame locked to
V-sync
bit[1:0] = 11 mode 3 mode 3: crystal frequency fixed
31 I clock source R/W 1 byte crystal
clock
This command is used to switch from an
internal crystal controlled clock source to an
external clock source and vice versa.
bit0=0 crystal clock
bit1=1 external clock
32 I clock auto mode R/W 1 byte mode
fixed
This command sets the behaviour of the
SAA6752HS in Clock mode 2 if video sync
cannot be achieved. Either mode 2 is
continued or the SAA6752HS will
automatically switch to mode 1 or mode 3, as
selected.
bit[1:0] = 00 mode fixed
bit[1:0] = 01 enable mode 2 and 1
auto-switch
bit[1:0] = 10 enable mode 2 and 3
auto-switch
33 I enable system
clock output
R/W 1 byte disable This command outputs the internal crystal
generated clock (27 MHz) to an output
pin CLKOUT for use in other parts of an
application.
bit0=0 disabled
bit0=1 enabled
34 all adjust crystal
oscillator
R/W 1 byte −128 to +127 0 adjust the frequency of the oscillator