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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.
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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