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Connectivity line devices: reset and clock control (RCC)
RM0008
7.3.12
Clock configuration register2 (RCC_CFGR2)
Address offset: 0x2C
Reset value: 0x0000 0000
Access: no wait state, word, half-word and byte access
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
I2S3S
I2S2S
PREDI
Reserved
RC
rw
RC
rw
V1SRC
rw
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PLL3MUL[3:0]
PLL2MUL[3:0]
PREDIV2[3:0]
PREDIV1[3:0]
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
7
Bits 31:19 Reserved, always read as 0.
Bit 18 I2S3SRC : I2S3 clock source
Set and cleared by software to select I2S3 clock source. This bit must be valid before
enabling I2S3 clock.
0: System clock (SYSCLK) selected as I2S3 clock entry
1: PLL3 VCO clock selected as I2S3 clock entry
Bit 17 I2S2SRC : I2S2 clock source
Set and cleared by software to select I2S2 clock source. This bit must be valid before
enabling I2S2 clock.
0: System clock (SYSCLK) selected as I2S2 clock entry
1: PLL3 VCO clock selected as I2S2 clock entry
Bit 16 PREDIV1SRC : PREDIV1 entry clock source
Set and cleared by software to select PREDIV1 clock source. This bit can be written only
when PLL is disabled.
0: HSE oscillator clock selected as PREDIV1 clock entry
1: PLL2 selected as PREDIV1 clock entry
Bits 15:12 PLL3MUL[3:0] : PLL3 Multiplication Factor
Set and cleared by software to control PLL3 multiplication factor. These bits can be written
only when PLL3 is disabled.
00xx: Reserved
010x: Reserved
0110: PLL3 clock entry x 8
0111: PLL3 clock entry x 9
1000: PLL3 clock entry x 10
1001: PLL3 clock entry x 11
1010: PLL3 clock entry x 12
1011: PLL3 clock entry x 13
1100: PLL3 clock entry x 14
1101: Reserved
1110: PLL3 clock entry x 16
1111: PLL3 clock entry x 20
134/995
Doc ID 13902 Rev 9
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