W681307DG Datasheet, PDF (112/160 Pages) Winbond – USB1.1 CODEC Microprocessor Control Unit with 32KB Mask ROM and 4KB RAM.

W681307
ADown
CODECAPd
0x1509[6]
CODEC
Analog
SWC_in ₀
1
CODEC
Digital
DAout
PDMEN
0x1503[1]
Ringer
Tone
Generation
(dd209_rt)
Half
AEC
0x14C1
PCM
Format
0x1485
Tone
Geneator
0x1488-0x148C
0x1484
PDM
1
SNDR
0
PWM
SNDRSigSel
0x 1503[0]
0x1486
Linear
PCM
SNDR_in
RefClkSel[1:0]
RefClkOn
system clock
Rclk_SNDR_Sel
Figure 14-2 Sounder signal selection circuit
negedge clk control logic
On
cnt
0
1
counter to 7 ₂
00
0
01
10
1
Muxed_SNDR
11
Figure 14-3 Reference clock frequency rate and function selection circuit.
14.4
Frequency Adjustment of Crystal Oscillator
A 13.824 MHz crystal is connected to pin XTAL1 and XTAL2. But the accuracy of the system clock will affect the performance and
power saving capability of a handset operating in suspend mode. The frequency deviation resulted from the variation of crystal device and
external load capacitances can be adjusted by the on-chip capacitances.
FACO (Frequency Adjustment of Crystal Oscillator) controls the connection of on-chip capacitance Cg and Cd to the crystal oscillator
pins XTAL1 and XTAL2 respectively. The total maximum value is 11.9pF per pin. Therefore this register can control the frequency of
the crystal oscillator at 13.824 MHz. accurately.
FACO
Address
0x1504
Access Mode Value At Reset Nominal Value
R/W
0x00
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Publication Release Date: May, 2007
Revision 1.3