RM0453 Rev 2 339/1454
RM0453 Reset and clock control (RCC)
363
7.4.32 RCC extended clock recovery register (RCC_EXTCFGR)
Address offset: 0x108
Reset value: 0x0003 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
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
C2
HPREF
SHD
HPREF
rr
1514131211109 8 765432 1 0
Res. Res. Res. Res. Res. Res. Res. Res. C2HPRE[3:0] SHDHPRE[3:0]
rw rw rw rw rw rw rw rw
Bits 31:18 Reserved, must be kept at reset value.
Bit 17 C2HPREF: HCLK2 prescaler flag (CPU2)
This bit is set and cleared by hardware to acknowledge HCLK2 prescaler programming. It is
reset when a new prescaler value is programmed in C2HPRE[3:0]. This bit is set when the
programmed value is actually applied.
0: HCLK2 prescaler value not yet applied
1: HCLK2 prescaler value applied
Bit 16 SHDHPREF: HCLK3 shared prescaler flag (AHB3, Flash, SRAM1, and SRAM2)
This bit is set and cleared by hardware to acknowledge the shared HCLK3 prescaler
programming. It is reset when a new prescaler value is programmed in SHDHPRE[3:0]. This
bit is set when the programmed value is actually applied.
0: HCLK3 prescaler value not yet applied
1: HCLK3 prescaler value applied
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