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MB90335 Series
■ Measurement Mode and Counter Operation
The measurement mode can be selected from six types depending on the place where the input pulse is
measured. The cycle measurement mode is also prepared to arbitrarily divide the input pulse for high-
precision measurement of higher frequency pulse width. Table 13.3-6 shows the measurement mode list.
Table 13.3-6 The Measurement Mode List (1 / 2)
Measurement
MOD2 MOD1 MOD0
mode
"H" pulse width
1
measurement
"L" pulse width
1
measurement
Rising
Between edges
1
Measurement at
cycle
Falling
Between edges
1
Measurement at
cycle
Between all edges
pulse width
0
measurement
CM44-10137-6E
0
1
The width at "H" period is measured.
Count (measurement) start: when detecting a rising edge
Count (measurement) end: when detecting a falling edge
1
0
The width at "L" period is measured.
Count (measurement) start: when detecting a falling edge
Count (measurement) end: when detecting a rising edge
0
0
A cycle between rising edges is measured.
Count (measurement) start: when detecting a rising edge
Count (measurement) end: when detecting a rising edge
1
1
A cycle between falling edges is measured.
Count (measurement) start: when detecting a falling edge
Count (measurement) end: when detecting a falling edge
1
0
The width between the edges continuously input is measured.
Count (measurement) beginning: When edge is detected
Count (measurement) end: When edge is detected
FUJITSU MICROELECTRONICS LIMITED
Measurement mode measured target
(W: width of a measured pulse)
W
Count start Count stop
Start
W
Count start Count stop
Start
W
W
Count stop
Count start
Start
W
W
Count stop
Count start
Start
W
W
Count stop
Count start
Start
CHAPTER 13 PWC TIMER
13.3 Movement of PWC Timer
W
Stop
W
Stop
W
Stop
Start
Stop
W
Stop
Start
Stop
W
Stop
Start
Stop
311
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