MCBSTM32EXL【PDF 68/995 页】BOARD EVALUATION FOR STM32F103ZE

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Backup registers (BKP)

RM0008

5.4

5.4.1

BKP registers

Refer to Section 1.1 on page 37 for a list of abbreviations used in register descriptions.

Backup data register x (BKP_DRx) (x = 1 ..42)

Address offset: 0x04 to 0x28, 0x40 to 0xBC

Reset value: 0x0000 0000

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

D[15:0]

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

Bits 15:0 D[15:0] Backup data

These bits can be written with user data.

Note: The BKP_DRx registers are not reset by a System reset or Power reset or when the

device wakes up from Standby mode.

They are reset by a Backup Domain reset or by a TAMPER pin event (if the TAMPER

pin function is activated).

5.4.2

RTC clock calibration register (BKP_RTCCR)

Address offset: 0x2C

Reset value: 0x0000 0000

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

ASOS

ASOE

CCO

CAL[6:0]

Reserved

rw

rw

rw

rw

rw

rw

rw

rw

rw

rw

Bits 15:10 Reserved, always read as 0.

Bit 9 ASOS: Alarm or second output selection

When the ASOE bit is set, the ASOS bit can be used to select whether the signal output on

the TAMPER pin is the RTC Second pulse signal or the Alarm pulse signal:

0: RTC Alarm pulse output selected

1: RTC Second pulse output selected

Note: This bit is reset only by a Backup domain reset.

Bit 8 ASOE: Alarm or second output enable

Setting this bit outputs either the RTC Alarm pulse signal or the Second pulse signal on the

TAMPER pin depending on the ASOS bit.

The output pulse duration is one RTC clock period. The TAMPER pin must not be enabled

while the ASOE bit is set.

Note: This bit is reset only by a Backup domain reset.

Bit 7 CCO: Calibration clock output

0: No effect

1: Setting this bit outputs the RTC clock with a frequency divided by 64 on the TAMPER pin.

The TAMPER pin must not be enabled while the CCO bit is set in order to avoid unwanted

Tamper detection.

Note: This bit is reset when the V DD supply is powered off.

68/995

Doc ID 13902 Rev 9

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