7906 datasheet(433/531 Pages) RENESAS

433 / 531 page

7906 Group User’s Manual Rev.2.0

APPENDIX

20-28

Appendix 2. Control registers

s Pulse period/Pulse width measurement mode

Note: Reading from this register must be performed in a unit of 16 bits.

Undefined

15 to 0

The measurement result of pulse period or pulse width is read out.

Timer B0 register (Addresses 5116, 5016)

Timer B1 register (Addresses 5316, 5216)

Timer B2 register (Addresses 5516, 5416)

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

Operating mode select bits

Measurement mode select bits

Count-type select bit

Timer Bi overflow flag (Note)

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

1 0 : Pulse period/Pulse width measurement mode

b1 b0

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.

b3 b2

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Note: The timer Bi overflow flag is cleared to “0” when a value is written to the timer Bi mode register with the count start bit = “1.”

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

0 : No overflow

1 : Overflowed

Undefined

(b15)

(b8)

Bit

Function

At reset

R/W

Bit name

Bit

Function

At reset

R/W

Reference

8-21

Reference

8-21

8-23

8-24

8-7

0 : Counter clear type

1 : Free-run type

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