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Chapter 23 Sub Oscillation Stabilisation Timer
8.Caution
8. Caution
• If the setting request (WIF=“1”) of the timer interrupt request flag and the writing timing where “0” is written to
the flag by the software occur simultaneously, the flag is set to “1”.
• If the interrupt request is enabled (WIE=“1”) after defeating a reset, and if the interval time is changed, be
sure to simultaneously set “0” to the interrupt request enable flag (WIF) and the clear bit (WCL).
• Read-modify-write
The interrupt request flag (WIF) is always read as “1” with the Read-modify-write.
• The setting initialization reset (INIT terminal input, watchdog reset) initializes the values of the timer interrupt
request bit (WIF), timer interrupt request enable bit (WIE), timer enable bit (WEN) and timer clear bit (WCL)
to “0”, but cannot initialize the interval period selection bit (WS[1:0]). Be sure to set it by the software.
• Setting the initial value of the sub oscillation stabilisation timer control register is possible using the
initialization reset (INIT terminal input, watchdog reset), but the operation initialization reset (Software reset)
holds the current value instead of initializing the value of the sub oscillation stabilisation timer control
register.
• The value for the oscillation stability wait time is an estimated value because the oscillation period of the
main clock oscillation is unstable for the beginning immediately after the oscillation has started.
• An unstable clock may be supplied to the entire device, and normal operation is not guaranteed if the
subclock is made to oscillate starting from subclock stopped state, and if the MCU operation mode is
switched from the main RUN to the sub-RUN mode without waiting until the subclock oscillation becomes
stable. Be sure to acquire the subclock oscillation stability wait time using the sub oscillation stabilisation
timer, etc. (If the main clock is selected as the clock source, the oscillation stability wait time for the subclock
may not be acquired.)
• The value for the oscillation stability wait time is an estimated value because the oscillation period of the
subclock is unstable for the beginning immediately after it has started.
• As the sub oscillation stabilisation timer stops while the subclock stops oscillating, a clock interrupt (interval
interrupt) is not generated either. If processing using the clock interrupt (interval interrupt) is performed,
enable the subclock oscillation. (Do not stop the subclock oscillation).
• The sub oscillation stabilisation timer counts up with the subclock. As a result, the timer stops counting
because the subclock stops oscillating under the following conditions.
• If the subclock is set that it stops in the stop mode (Subclock oscillation enable bit* =“1”), and then the
mode is switched to the stop mode, the sub oscillation stabilisation timer stops counting while in the stop
mode.
• If you want the sub oscillation stabilisation timer to continue counting while in stop mode, set the subclock
oscillation enable bit to “0” before switching the mode to the stop mode.
• If the subclock stop bit =“1” while in the subclock, and if the subclock is specified so that it stops
oscillating while the subclock is in operation, the sub oscillation stabilisation timer stops, too, while the
subclock is in operation.
Содержание FR Family FR60 Lite
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Страница 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
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Страница 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Страница 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Страница 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Страница 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Страница 169: ...153 Chapter 9 Reset 10 Caution ...
Страница 170: ...154 Chapter 9 Reset 10 Caution ...
Страница 180: ...164 Chapter 10 Standby 7 Q A ...
Страница 182: ...166 Chapter 10 Standby 8 Caution ...
Страница 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
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Страница 222: ...206 Chapter 13 Clock Control 8 Caution ...
Страница 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Страница 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Страница 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Страница 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Страница 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Страница 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Страница 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Страница 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Страница 412: ...396 Chapter 28 Bit Search 8 Caution ...
Страница 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Страница 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Страница 549: ...533 Chapter 31 External Bus 2 External Bus Interface Registers is set to the high impedance state ...
Страница 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Страница 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Страница 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Страница 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Страница 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Страница 790: ...774 Chapter 37 Output Compare 8 Caution ...
Страница 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Страница 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Страница 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Страница 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Страница 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Страница 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Страница 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Страница 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Страница 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Страница 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Страница 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Страница 1032: ...1016 Chapter 55 Flash Security 4 Register ...
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