7733 datasheet(191/940 Pages) RENESAS

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TIMER B

7733 Group User’s Manual

7–28

7.5 Pulse period/Pulse width measurement mode

Fig. 7.5.2 Initial setting example for registers related to pulse period/pulse width measurement mode

Counting is started.

Measurement mode selection bits

Selection of the pulse period/pulse width measurement mode and each function

Timer Bi mode register (i = 0 to 2) (addresses 5B16 to 5D16)

Setting of the count start flag to “1”

Count start flag (address 4016)

Timer B0 count start flag

Timer B1 count start flag

Timer B2 count start flag

Must be fixed to “0” (for i = 0).

b3 b2

Setting of the interrupt priority level

Timer Bi interrupt control register

(addresses 7A16 to 7C16)

Interrupt priority level selection bits

When using interrupts, one of levels 1 to 7 must be set.

When disabling interrupts, level 0 must be set.

Count source selection bits

b7 b6

Timer Bi overflow flag (Note)

0: No overflow

1: Overflow

Setting of the port P6 direction register

Port P6 direction register (address 1016)

Clear the corresponding bit to “0.”

Pin TB0IN

Pin TB1IN

Pin TB2IN

0 0: Pulse period measurement

(Interval between falling edges)

0 1: Pulse period measurement

(Interval between rising edges)

1 0: Pulse width measurement

1 1: Do not select.

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

Note: The timer Bi overflow flag is a read-only flag. This flag is cleared to “0” when writing to timer Bi mode register is performed with the count start flag = “1.”

Clocks f2, f16, f64, and f512:

Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Pulse period/Pulse width measurement mode is selected.

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