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CHAPTER 12 16-BIT RELOAD TIMER
12.6.3
Event Count Mode
The 16-bit reload timer counts an input edge from the TIN0/TIN1 pin, counts down the
16-bit counter, and generates an interrupt request to the CPU for a counter underflow. It
can also output a toggle waveform or rectangular waveform from the TO0/TO1 pin.
■
Event Count Mode
When counting is enabled (TMCSRL0/TMCSRL1:CNTE = 1) and the counter is started (TMCSRL0/
TMCSRL1:TRG = 1), the value of the reload register is loaded into the counter. Counting down is then
done every time a valid edge (rising, falling, and both edges can be selected) of the pulse input to the TIN
pin (external count clock) is detected.
When the count enable bit and software trigger bit are set to "1" simultaneously, counting is started
simultaneously with the enabling of counting.
●
Operation in reload mode
When an underflow of the counter value (from 0000
H
to FFFF
H
) occurs, the value of the reload register
(TMRD0/TMRD1) is loaded into the counter, and counting continues. If the underflow interrupt flag
(TMCSRL0/TMCSRL1:UF) bit is set to "1" and the underflow interrupt enable bit (TMCSRL0/
TMCSRL1:INTE) is "1", an interrupt request is generated.
The timer can also output from the TO0/TO1 pin a toggle waveform, which is inverted for each underflow.
Figure 12.6-10 shows counting in reload mode.
Figure 12.6-10 Count Operation in Reload Mode (Event Count Mode)
Note:
Specify 4/
φ
or more for the H and L widths of the clock input to the TIN0/TIN1 pin.
Reload data
TIN pin
Counter
Data load signal
UF bit
CNTE bit
TRG bit
TO pin
Reload data
Reload data
Reload data
T: Machine cycle
*
It takes 1T time from trigger input to loading of the reload data.
Содержание MB90460 Series
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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 ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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