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CHAPTER 14 MULTI-FUNCTIONAL TIMER
14.7
Usage Notes on the Multi-functional Timer
Notes on using the multi-functional timer are given below.
■
Usage Notes on the 16-bit Free-run Timer
●
Notes about using a program for setting
•
After reset, the timer value is "0000
H
", zero detect interrupt flag will be set to "1" in next count clock
after timer enable (TCCSL:STOP=0).
•
Since the timer mode bit (TCCSL:MODE) has a buffer, changing timer mode will take effect in next
count cycle. Zero detect interrupt is always generated when timer mode is changed from up-count to up-
down count mode.
•
Software clear timer (TCCSL:SCLR=1) will initialize the timer but not generate zero detect interrupt.
●
Notes about interrupts
•
When the IRQZF bit of the timer control status register (TCCSH) is set to "1" and an interrupt request is
enabled (TCCSH:IRQZE=1), control cannot be returned from interrupt processing. Always clear the
IRQZF bit.
•
When the ICLR bit of the timer control status register (TCCSH) is set to "1" and an interrupt request is
enabled (TCCSH:ICRE=1), control cannot be returned from interrupt processing. Always clear the
ICLR bit.
•
Since the 16-bit free-run timer shares an interrupt vector with other resource, interrupt causes must be
checked carefully by the interrupt processing routine when interrupts are used.
Also, when EI
2
OS is used by the 16-bit free-run timer, shared resource interrupts must be disabled.
■
Usage Notes on the 16-bit Output Compare
●
Notes about interrupts
•
When the IOP bit of the compare control register (OCS0/OCS2/OCS4) is set to "1" and an interrupt
request is enabled (OCS0/OCS2/OCS4:IOE=1), control cannot be returned from interrupt processing.
Always clear the IOP bit.
•
Since the 16-bit output compare shares an interrupt vector with other resource, interrupt causes must be
checked carefully by the interrupt processing routine when interrupts are used.
Also, when EI
2
OS is used by the 16-bit output compare, shared resource interrupts must be disabled.
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
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Страница 9: ...iv ...
Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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