APPOTECH CW6632B - Page 38

32 4.3 Clock System
CW6632B Bluetooth 3.0 Audio Player SOC Version 1.0.0
Copyright ©2015, www.appotech.com. All Rights Reserved.
01 = External 32 KHz or 12MHz crystal oscillator controlled by PCON3 [5]
10 = PLL 48/24/16/12 MHz output, controlled by CLKCON1 [1:0]
11 = Reserve
Register 4-7 CLKCON1 – Clock control 1
Position
7
6
5
4
3
2
1
0
Name
ATCLKSEL
---
DECDIV
SYSDIV
PLLDIVSEL
Default
0
0
0
0
0
0
0
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ATCLKSEL: Audio clock select
00 = Select external 12MHz crystal oscillator invert
01 = Select external 12MHz crystal oscillator
10 = Select PLL 24MHz output invert
11 = Select PLL 24MHz output
xosc_
xosc_tclk
pll_d2_
pll_d2
00
01
10
11
MUX
eq_clk
CLKCON1[7:6]
PCON3[5]
dac_clk
PCON1[7]
Figure 4-4 DAC clock select figure
DECDIV: Decoder clock divide 2 from system clock
0 = Disable
1 = Enable
SYSDIV: System clock divide from clock source
00 = System clock source
01 = Divided by 2 from system clock source
10 = Divided by 4 from system clock source
11 = Divided by 8 from system clock source
PLLDIVSEL: PLL output divide select
00 = Select 48MHz output
01 = Select 24MHz output
10 = Select 16MHz output
11 = Select 12MHz output
Register 4-8 CLKCON2 – Clock control 2
Position
7
6
5
4
3
2
1
0
Name
IISREFCSEL
IISBCSEL
TSCLK_OUT_SEL
IR32K_SEL
IR_CLK_SEL
Default
0
0
0
0
0
0
0
0