M16CSLASH26 datasheet(98/239 Pages) RENESAS

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Renesas Technology Corp.

Timer B

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Item

Specification

Count source

f1, f2, 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”. Assume that the count start flag condition is “1” and then

the timer Bi overflow flag becomes “1”. If the timer Bi mode register has a

write-access after next count cycle of the timer from the above condition, the

timer Bi overflow flag becomes “0”.)

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

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

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

input after the timer has started counting.

(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 1.13.8.)

Figure 1.13.21 shows the timer Bi mode register in pulse period/pulse width measurement mode. Figure

1.13.22 shows the operation timing when measuring a pulse period. Figure 1.13.23 shows the operation

timing when measuring a pulse width.

Table 1.13.8. Timer specifications in pulse period/pulse width measurement mode

Figure 1.13.21. Timer Bi mode register in pulse period/pulse width measurement mode

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i=0 to 2)

039B16 to 039D16

00XX00002

Bit name

Bit symbol

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 : Must not be set.

Function

b3 b2

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.

Count source

select bit

Timer Bi overflow

flag ( Note 1)

0 : Timer did not overflow

1 : Timer has overflowed

0 0 : f1 or f2

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

Note 1: It is indeterminate when reset. Assume that the count start flag condition is 1 and then the timer Bi

overflow flag becomes 1 . If the timer Bi mode register has a write access after next count cycle of

the timer from the above condition, the timer Bi overflow flag becomes 0 . This flag cannot be set to

1 by software.

Note 2: Timer B0.

Note 3: Timer B1, timer B2.

0 (Must always be 0 in pulse period/pulse width measurement mode; i = 0)

(Note 2)

(Note 3)

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