upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 177
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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(9) Capture operation
(10) Edge detection
(11) Timer operation
Remark f
(a) When valid edge of TI000 is specified as count clock
(b) Pulse width to accurately capture value by signals input to TI010 and TI000 pins
(c) Generation of interrupt signal
(d) Note when CRC001 (bit 1 of capture/compare control register 00 (CRC00)) is set to 1
(a) Specifying valid edge after reset
(b) Sampling clock for eliminating noise
The signal input to the TI000/TI010 pin is not acknowledged while the timer is stopped, regardless of the
operation mode of the CPU.
When the valid edge of TI000 is specified as the count clock, the capture register for which TI000 is specified
as a trigger does not operate correctly.
To accurately capture the count value, the pulse input to the TI000 and TI010 pins as a capture trigger must
be wider than two count clocks selected by PRM00 (see Figure 6-7).
The capture operation is performed at the falling edge of the count clock but the interrupt signals (INTTM000
and INTTM010) are generated at the rising edge of the next count clock (see Figure 6-7).
When the count value of the TM00 register is captured to the CR000 register in the phase reverse to the
signal input to the TI000 pin, the interrupt signal (INTTM000) is not generated after the count value is
captured. If the valid edge is detected on the TI010 pin during this operation, the capture operation is not
performed but the INTTM000 signal is generated as an external interrupt signal. Mask the INTTM000 signal
when the external interrupt is not used.
If the operation of the 16-bit timer/event counter 00 is enabled after reset and while the TI000 or TI010 pin is
at high level and when the rising edge or both the edges are specified as the valid edge of the TI000 or TI010
pin, then the high level of the TI000 or TI010 pin is detected as the rising edge. Note this when the TI000 or
TI010 pin is pulled up. However, the rising edge is not detected when the operation is once stopped and
then enabled again.
The sampling clock for eliminating noise differs depending on whether the valid edge of TI000 is used as the
count clock or capture trigger. In the former case, the sampling clock is fixed to f
clock selected by PRM00 is used for sampling.
When the signal input to the TI000 pin is sampled and the valid level is detected two times in a row, the valid
edge is detected. Therefore, noise having a short pulse width can be eliminated (see Figure 6-7).
PRS
: Peripheral hardware clock frequency
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Preliminary User’s Manual U19014EJ1V0UD
PRS
. In the latter, the count
177
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