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Chapter 10
16-bit Inverter Timer/Counter R
User’s Manual U16580EE3V1UD00
10.10.7 Pulse width measurement mode (TMR1 only)
(1)
Outline of pulse width measurement mode
In the pulse width measurement mode, counting is performed in the free-running mode. The
counter value is saved to the TR1CCR0 register, and the counter is cleared to 0000H. As a result,
the external input pulse width can be measured. However, when measuring a long pulse width that
exceeds counter overflow, perform judgment with the overflow flag. Measurement of pulses during
which overflow occurs twice or more is not possible, so adjust the counter's operating frequency.
Even in the case of TIR11 to TIR13 pin edge detection, pulse width measurement can be similarly
performed by using the TR1CCR1 to TR1CCR3 registers.
Figure 10-54:
Basic Operation Timing in Pulse Width Measurement Mode
(TR1OE0, 1 = 0, TR1OL0, 1 = 0)
Remarks: 1.
D00, D01, D02, D03: Values captured to TR1CCR0 register (0000H to FFFFH)
2.
TIR10: Setting to rising edge/falling edge (both edges) detection (TRnIOC1 register
bits TR1IS1, TR1IS0 = 1B)
Cautions: 1. In the pulse width measurement mode the external event clock input (TEVTR1) is
prohibited (TR1CTL1.TR1EEE = 0).
2. When an internal count clock
≤
f
XX
/16 (TP1CTL0.TP1CKS2-0) is selected in pulse
width measurement mode, and a valid signal edge is input before the first count
up, the a value of FFFFH will be captured in the corresponding TP1CCR0 or
TP1CCR1 register.
Counter
FFFFH
INTTR1CC0
TIR10
TR1CE
TR1OVF
D
00
TR1CCR0
0000H
D
00
D
01
D
02
D
03
D
01
D
02
D
03
FFFFH
INTTR1OV
Cleared through 0
write from CPU
Содержание V850E/PH2
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