7733 datasheet(189/940 Pages) RENESAS

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TIMER B

7733 Group User’s Manual

7–26

7.5 Pulse period/Pulse width measurement mode

Fig. 7.5.1 Structures of timer Bi mode register and timer Bi register in pulse period/pulse width

measurement mode

b0 b7

(b15)

(b8)

Timer B0 register (addresses 5116, 5016)

Timer B1 register (addresses 5316, 5216)

Timer B2 register (addresses 5516, 5416)

Functions

Bit

At reset

15 to 0 The result of the pulse period or pulse width

measurement is read out.

Un-

defined

0 0: Pulse period measurement

( interval between falling edges of the

measurement pulse)

0 1: Pulse period measurement

Interval between rising edges of the

measurement pulse)

1 0: Pulse width measurement

(

Interval from a falling edge to a rising edge,

and

from a risi ng edge to a falling edge of

the measurement pulse)

1 1: Do not select.

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

Bit

Count source selection bits

Timer Bi overflow flag (Note)

•Timer B0 mode register

Must be fixed to “0.”

Measurement mode selection

bits

Operating mode selection bits

Bit name

Functions

1 0: Pulse period/pulse width measurement

b1 b0

0: No overflow

1: Overflow

b3 b2

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

b7 b6

At reset

Un-

defined

•Timer B1 and B2 mode registers

Not implemented.

Clocks f2, f16, f64, and f512: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Note: Timer Bi overflow flag is cleared to “0” when writing to the timer Bi mode register is performed with the

count start flag = “1.” This flag cannot be set to “1” by software.

—

mode

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