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231
CHAPTER 12 16-BIT RELOAD TIMER
■
Event Count Mode (External Clock Mode)
When selected valid edges (rising, falling and both edges) are input to TIN0 and TIN1 pins, the
timer counts down at these edges in channel 0 and 1 respectively.
When an external clock with a constant period is used, this timer can also be used as an interval
timer.
■
Counter Operation
●
Reload mode
When an underflow (from 0000
H
to FFFF
H
) occurs during counting down, the count setting value is
reloaded to continue counting. Since the 16-bit reload timer causes an interrupt request to occur for an
underflow condition, it can be used as an interval timer.
A toggle waveform inverted at each underflow cab also be output from TO0 and TO1 pins.
Table 12.1-2 lists the intervals for the 16-bit reload timer.
●
Single-shot mode
When an underflow (from 0000
H
to FFFF
H
) occurs during counting down, counting stops, causing an
interrupt to occur for the underflow condition.
During counter operation, a rectangular waveform that indicates when the count is in progress can be
output from the TO0 and TO1 pins.
References:
• 16-bit reload timer 0 can be used to create the baud rate of UART0 or enable data transfer in
waveform sequencer.
• 16-bit reload timer 1 can be used as the start trigger of the A/D converter or the baud rate of
UART1.
Table 12.1-2 Intervals for the 16-bit Reload Timer
Count clock
Count clock period
Interval
Internal clock
2
1
/
φ
(0.125 µs)
0.125 µs to 8.192 ms
2
3
/
φ
(0.5 µs)
0.5 µs to 32.768 ms
2
5
/
φ
(2.0 µs)
2.0 µs to 131.1 ms
External clock
2
3
/
φ
or more (0.5 µs)
0.5 µs or more
φ
: Machine clock
Values in parentheses are for a 16 MHz machine clock.
Содержание MB90460 Series
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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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