7721 datasheet(191/577 Pages) RENESAS

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7721 Group User’s Manual

TIMER B

9–24

9.5 Pulse period/Pulse width measurement mode

Fig. 9.5.3 Operation during pulse period measurement

Fig. 9.5.4 Operation during pulse width measurement

Count source

Measurement pulse

Timing at which counter is

cleared to “000016”

Note: The above applies when measurement is performed for an interval from one falling edge to the next

falling edge of the measurement pulse.

Reload register

Counter

Transfer timing

Count start bit

Counter is initialized by completion of measurement.

Counter overflow.

Cleared to “0” when interrupt request is accepted or

cleared by software.

Timer Bj interrupt

request bit

Timer Bj overflow flag

Transferred

(undefined value)

Transferred

(measured value)

Measurement pulse

Count source

Timing at which counter is

cleared to “000016”

Count start bit

Timer Bj interrupt

request bit

Timer Bj overflow flag

Reload register

Counter

Transfer timing

Counter is initialized by completion of measurement.

Counter overflow.

Transferred

(measured

value)

Transferred

(measured

value)

Transferred

(measured

value)

Transferred

(undefined

value)

Cleared to “0” when interrupt request is accepted or

cleared by software.

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