M306V2EEFS datasheet(95/271 Pages) RENESAS

95 / 271 page

Rev.1.40

Oct 06, 2004 page 95 of 269

M306V2ME-XXXFP, M306V2EEFP

Table 2.10.7 Timer specifications in pulse period/pulse width measurement mode

Notes 1: An interrupt request is not generated when the first effective edge is input after the timer has started counting.

2: The value read out from the timer Bi register is indeterminate until the second effective edge is input after the timer.

(3) Pulse period/pulse width measurement mode

In this mode, the timer measures the pulse period or pulse width of an external signal. (See Table 2.10.7)

Figure 2.10.23 shows the timer Bi mode register in pulse period/pulse width measurement mode. Figure

2.10.24 shows the operation timing when measuring a pulse period. Figure 2.10.25 shows the operation

timing when measuring a pulse width.

Item

Specification

Count source

f1, f8, f32, fc32

Count operation

• Up count

• Counter value “000016” is transferred to reload register at measurement pulse's

effective edge and the timer continues counting

Count start condition

Count start flag is set (= 1)

Count stop condition

Count start flag is reset (= 0)

Interrupt request generation timing • When measurement pulse's effective edge is input (Note 1)

• When an overflow occurs. (Simultaneously, the timer Bi overflow flag changes to “1”.

The timer Bi overflow flag changes to “0” when the count start flag is “1” and a value

is written to the timer Bi mode register.)

TBiIN pin function

Measurement pulse input

Read from timer

When timer Bi register is read, it indicates the reload register’s content

(measurement result) (Note 2)

Write to timer

Cannot be written to

Figure 2.10.23 Timer Bi mode register in pulse period/pulse width measurement mode (i = 0 to 2)

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i=0 to 2)

039B16 to 039D16

00?X00002

Bit name

Bit symbol

b7b6

Operation mode

select bit

1 0 : Pulse period / pulse width

measurement mode

b1 b0

TMOD1

TMOD0

MR0

Measurement mode

select bit

MR2

MR1

MR3

TCK1

TCK0

0 0 : Pulse period measurement (Interval between

measurement pulse's falling edge to falling edge)

0 1 : Pulse period measurement (Interval between

measurement pulse's rising edge to rising edge)

1 0 : Pulse width measurement (Interval between

measurement pulse's falling edge to rising edge,

and between rising edge to falling edge)

1 1 : Inhibited

Function

b3 b2

Count source

select bit

Timer Bi overflow

flag ( Note 1)

0 : Timer did not overflow

1 : Timer has overflowed

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

Notes 1: The timer Bi overflow flag changes to “0” when the count start flag is “1” and a value is written to the

timer Bi mode register. This flag cannot be set to “1” by software.

2: Timer B0.

3: Timer B1, timer B2.

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

(Note 2)

(Note 3)

Nothing is assigned (i = 1, 2).

In an attempt to write to this bit, write “0.” The value, if read, turns out to be

indeterminate.

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