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■ 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
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.
Table 12.1-2 Intervals for the 16-bit Reload Timer
φ: Machine clock
Values in parentheses are for a 16 MHz machine clock.
●
Single-shot mode
When an underflow (from 0000
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.
to FFFF
H
Count clock
Internal clock
External clock
to FFFF
H
CHAPTER 12 16-BIT RELOAD TIMER
) occurs during counting down, the count setting value is
H
Count clock period
1
2
/φ (0.125 µs)
3
2
/φ (0.5 µs)
5
2
/φ (2.0 µs)
3
2
/φ or more (0.5 µs)
) occurs during counting down, counting stops, causing an
H
Interval
0.125 µs to 8.192 ms
0.5 µs to 32.768 ms
2.0 µs to 131.1 ms
0.5 µs or more
231
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