M30620ECFS datasheet(333/621 Pages) RENESAS

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Timer B

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

318

In event counter mode, choose functions from those listed in Table 2.3.2. Operations of the circled items are

described below. Figure 2.3.6 shows the operation timing, and Figure 2.3.7 shows the set-up procedure.

2.3.3 Operation of Timer B (event counter mode)

Item

Set-up

Count source

Input signal to the TBiIN pin (counting falling edges)

Timer overflow(TBj overflow)

Input signal to the TBiIN pin (counting rising edges)

Input signal to the TBiIN pin (counting rising edges and falling edges)

Operation

Table 2.3.2. Choosed functions

Note: j = i – 1, but j = 2 when i = 0,j = 5 when i = 3

Figure 2.3.6. Operation timing of event counter mode

FFFF16

000016

Time

Count start flag

Timer Bi interrupt

request bit

“1”

n = reload register content

Set to “1” by software

“0”

Set to “1” by softwar

Cleared to “0” by

software

(1) Start count

(2) Underflow

(3) Stop count

Cleared to “0” when interrupt request is accepted, or cleared by software

Start count again

(1) Setting the count start flag to “1” causes the counter to count the falling edges of the count

source.

(2) If an underflow occurs, the content of the reload register is reloaded, and the count continues.

At this time, the timer Bi interrupt request bit goes to “1”.

(3) Setting the count start flag to “0” causes the counter to hold its value and to stop.

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