7721 datasheet(187/577 Pages) RENESAS

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7721 Group User’s Manual

TIMER B

9–20

9.5 Pulse period/Pulse width measurement mode

Fig. 9.5.1 Structures of timer Bj mode register and timer Bj register in pulse period/pulse width

measurement mode

Measurement mode select bits

Operating mode select bits

Bit name

Functions

Timer Bj mode register (j = 0, 1) (Addresses 5B16, 5C16)

1 0 : Pulse period/Pulse width

measurement mode

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Count source select bits

b1 b0

b3 b2

Nothing is assigned.

0 0 : Pulse period measurement

(Interval between falling edges

of measurement pulse)

0 1 : Pulse period measurement

(Interval between rising edges

of measurement pulse)

1 0 : Pulse width measurement

(Interval from a falling edge to a rising

edge, and from a rising edge to a

falling edge of measurement pulse)

1 1 : Do not select.

Bit

At reset

Undefined

–

Timer Bj overflow flag

(Note)

0 : No overflow

1 : Overflowed

Undefined

Note: The timer Bj overflow flag is cleared to “0” at the next count timing of the count source

when a value is written to the timer Bj mode register with the count start bit = “1.”

(b15)

(b8)

Timer B0 register (Addresses 5116, 5016)

Timer B1 register (Addresses 5316, 5216)

15 to 0 The measurement result of pulse period or

pulse width is read out.

Undefined

Note: Read from this register in a unit of 16 bits.

Functions

Bit

At reset

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