CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Preliminary User’s Manual U19014EJ1V0UD
167
(3) Measuring the pulse width by using one input signal of the TI000 pin (clear & start mode entered by the
TI000 pin valid edge input)
Set the clear & start mode entered by the TI000 pin valid edge (TMC003 and TMC002 = 10). The count value of
TM00 is captured to CR000 in the phase reverse to the valid edge of the TI000 pin, and the count value of TM00
is captured to CR010 and TM00 is cleared (0000H) when the valid edge of the TI000 pin is detected. Therefore,
a cycle is stored in CR010 if TM00 does not overflow.
If an overflow occurs, take the value that results from adding 10000H to the value stored in CR010 as a cycle.
Clear bit 0 (OVF00) of 16-bit timer mode control register 00 (TMC00) to 0.
Figure 6-50. Timing Example of Pulse Width Measurement (3)
•
TMC00 = 08H, PRM00 = 10H, CRC00 = 07H
FFFFH
TM00 register
0000H
Operable bits
(TMC003, TMC002)
Capture & count clear input
(TI000)
Capture register
(CR000)
Capture register
(CR010)
Capture interrupt
(INTTM010)
Overflow flag
(OVF00)
Capture trigger input
(TI010)
Capture interrupt
(INTTM000)
10
<1>
<2>
<3>
<3>
<3>
<3>
<2>
<2>
<2>
<1>
<1>
<1>
M
A
B
C
D
N
S
P
Q
00
00
0 write clear
0000H
L
L
A
B
C
D
0000H
M
N
S
P
Q
<1> Pulse cycle =
(10000H
×
Number of times OVF00 bit is set to 1 + Captured value of CR010)
×
Count clock cycle
<2> High-level pulse width = (10000H
×
Number of times OVF00 bit is set to 1 + Captured value of CR000)
×
Count clock cycle
<3> Low-level pulse width = (Pulse cycle
−
High-level pulse width)
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