ST STM32L4x6 User Manual

DocID024597 Rev 3 1089/1693
RM0351 Real-time clock (RTC)
1106
34.6.5 RTC prescaler register (RTC_PRER)
This register must be written in initialization mode only. The initialization must be performed
in two separate write accesses. Refer to Calendar initialization and configuration on
page 1070.
This register is write protected. The write access procedure is described in RTC register
write protection on page 1070.
Address offset: 0x10
Backup domain reset value: 0x007F 00FF
System reset: not affected
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. PREDIV_A[6:0]
rw rw rw rw rw rw rw
1514131211109876543210
Res. PREDIV_S[14:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:23 Reserved, must be kept at reset value
Bits 22:16 PREDIV_A[6:0]: Asynchronous prescaler factor
This is the asynchronous division factor:
ck_apre frequency = RTCCLK frequency/(PREDIV_A+1)
Bit 15 Reserved, must be kept at reset value.
Bits 14:0 PREDIV_S[14:0]: Synchronous prescaler factor
This is the synchronous division factor:
ck_spre frequency = ck_apre frequency/(PREDIV_S+1)

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English