MCBSTM32EXL【PDF 396/995 页】BOARD EVALUATION FOR STM32F103ZE

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Real-time clock (RTC)

RM0008

16.4.5

RTC counter register (RTC_CNTH / RTC_CNTL)

The RTC core has one 32-bit programmable counter, accessed through two 16-bit registers;

the count rate is based on the TR_CLK time reference, generated by the prescaler.

RTC_CNT registers keep the counting value of this counter. They are write-protected by bit

RTOFF in the RTC_CR register, and a write operation is allowed if the RTOFF value is ‘1’. A

write operation on the upper (RTC_CNTH) or lower (RTC_CNTL) registers directly loads the

corresponding programmable counter and reloads the RTC Prescaler. When reading, the

current value in the counter (system date) is returned.

RTC counter register high (RTC_CNTH)

Address offset: 0x18

Reset value: 0x0000

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RTC_CNT[31:16]

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Bits 15:0 RTC_CNT[31:16]: RTC counter high

Reading the RTC_CNTH register, the current value of the high part of the RTC Counter

register is returned. To write to this register it is necessary to enter configuration mode (see

Section 16.3.4: Configuring RTC registers on page 390 ).

RTC counter register low (RTC_CNTL)

Address offset: 0x1C

Reset value: 0x0000

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RTC_CNT[15:0]

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Bits 15:0 RTC_CNT[15:0]: RTC counter low

Reading the RTC_CNTL register, the current value of the lower part of the RTC Counter

register is returned. To write to this register it is necessary to enter configuration mode (see

Section 16.3.4: Configuring RTC registers on page 390 ).

396/995

Doc ID 13902 Rev 9

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