M30620FCAFP datasheet(366/615 Pages) RENESAS

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Timer B

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-49

Figure 2.3.11. Set-up procedure of pulse width measurement mode

Start count

Setting count start flag

Count start flag

[Address 038016]

TABSR

Timer B0 count start flag

Timer B1 count start flag

Timer B2 count start flag

Selecting pulse period / pulse width measurement mode and functions

Fixed to “0” in pulse period/pulse width measurement mode (i = 0, 3)

In an attempt to write to this bit, write “0” (i = 1, 2, 4, 5)

Selection of pulse period / pulse width measurement mode

Timer Bi overflow flag

0 : Timer did not overflow

1 : Timer has overflowed

Count source select bit

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

Measurement mode select bit

1 0 : Pulse width measurement (Interval between measurement pulse falling edge to

rising edge, and between rising edge to falling edge)

b3 b2

Clearing overflow flag

Timer Bi overflow flag

0 : Timer did not overflow

Setting clock prescaler reset flag

(This function is effective when fC32 is selected as the count source. Reset the prescaler for generating fC32 by

dividing the XCIN by 32.)

Clock prescaler reset flag [Address 038116]

CPSRF

Clock prescaler reset flag

0 : No effect

1 : Prescaler is reset (When read, the value is “0”)

Timer Bi mode register (i=0 to 5) [Address 039B16 to 039D16, 035B16 to 035D16]

TBiMR (i=0 to 5)

Count source period

f(XIN) : 16MHZ

f(XcIN) : 32.768kHZ

b7 b6

Count

source

62.5ns

500ns

2µs

976.56µs

f32

fC32

Timer B3,4,5 count start

flag

[Address 034016]

TBSR

Timer B3 count start flag

Timer B4 count start flag

Timer B5 count start flag

Timer Bi mode register (i=0 to 5) [Address 039B16 to 039D16, 035B16 to 035D16]

TBiMR (i=0 to 5)

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