Table of Contents
Advertisement
Real-time clock (RTC)
31
30
29
Res.
Res.
Res.
Res.
15
14
13
Res.
Res.
Res.
Res.
Bits 31:8 Reserved, must be kept at reset value
Bit 7 DCS: Digital calibration sign
Bits 6:5 Reserved, must be kept at reset value.
Bits 4:0 DC[4:0]: Digital calibration
Note:
This register can be written in initialization mode only (RTC_ISR/INITF = '1').
This register is write protected. The write access procedure is described in
write
protection.
642/1163
28
27
26
25
Res.
Res.
Res.
12
11
10
9
Res.
Res.
Res.
0: Positive calibration: calendar update frequency is increased
1: Negative calibration: calendar update frequency is decreased
DCS = 0 (positive calibration)
00000: +0 ppm
00001: +4 ppm (rounded value)
00010: +8 ppm (rounded value)
..
11111: +126 ppm (rounded value)
DCS = 1 (negative calibration)
00000: -0 ppm
00001: -2 ppm (rounded value)
00010: -4 ppm (rounded value)
..
11111: - 63 ppm (rounded value)
Refer to
Case of RTCCLK=32.768 kHz and PREDIV_A+1=128
24
23
22
Res.
Res.
Res.
8
7
6
Res.
DCS
Res.
rw
RM0402 Rev 6
21
20
19
18
Res.
Res.
Res.
Res.
5
4
3
2
Res.
DC[4:0]
rw
rw
rw
for the exact step value.
RTC register
RM0402
17
16
Res.
Res.
1
0
rw
rw
Advertisement
Table of Contents
Need help?
Do you have a question about the STM32F412 and is the answer not in the manual?
Questions and answers