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CHAPTER 27 REAL TIME CLOCK
27.6
Notes on using RTC
This section contains notes for using the real time clock.
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Behaviour of power-save mode
In power-saving mode (RTCCRL:PS=1), the RTC runs on the subclock. While in non-power-saving mode
(RTCCRL:PS=0), the RTC on the resource clock. As the RTC runs on the subclock in power-save mode,
the resource clock can be stopped. In the event when the resource clock is stopped in power-saving mode,
all user accessible registers (except RTCCRL:PS) are not writable. The read values are valid only for
RTCCRL, RTCCRH:MOC/DC/HC/MC, MICR, HOUR, HRCR, DYCR, MOCR and FFTR. Other registers
are indeterminate.
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Resource clock and subclock frequency
There is an limitation on the frequency of resource clock operating in non-power saving mode
(RTCCRL:PS=0). As resource clock is used as sampling clock for both timing and control logic, it must not
be slower than the subclock in non-power saving mode. resource clock must be at least 4 times the
frequency of subclock.
Содержание F2 MC-8FX Family
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Страница 30: ...16 CHAPTER 1 DESCRIPTION 1 FPT 64P M23 FPT 64P M24 2 For the I O circuit type refer to 1 8 I O Circuit Type ...
Страница 34: ...20 CHAPTER 1 DESCRIPTION ...
Страница 35: ...21 CHAPTER 2 HANDLING DEVICES This chapter gives notes on using 2 1 Device Handling Precautions ...
Страница 38: ...24 CHAPTER 2 HANDLING DEVICES ...
Страница 39: ...25 CHAPTER 3 MEMORY SPACE This chapter describes memory space 3 1 Memory Space 3 2 Memory Map ...
Страница 43: ...29 CHAPTER 4 MEMORY ACCESS MODE This chapter describes the memory access mode 4 1 Memory Access Mode ...
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Страница 105: ...91 CHAPTER 8 INTERRUPTS This chapter explains the interrupts 8 1 Interrupts ...
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Страница 482: ...468 CHAPTER 25 LOW VOLTAGE DETECTION RESET CIRCUIT ...
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Страница 564: ...550 CHAPTER 29 EXAMPLE OF SERIAL PROGRAMMING CONNECTION ...
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Страница 599: ...585 Pin Function Index V2 LCD power supply driving pin 2 439 V3 LCD power supply driving pin 3 439 ...
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