M30620FCAFP datasheet(335/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-18

Figure 2.2.12. Operation timing of event counter mode, reload type selected

2.2.5 Operation of Timer A (event counter mode, reload type selected)

In event counter mode, choose functions from those listed in Table 2.2.4. Operations of the circled items

are described below. Figure 2.2.12 shows the operation timing, and Figure 2.2.13 shows the set-up

procedure.

Note: j = i – 1, but j = 4 when i = 0.

(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 Ai interrupt request bit goes to “1”.

(3) If switching from an up count to a down count or vice versa while a count is in progress, the

switch takes effect from the next effective edge of the count source.

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

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

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

Operation

Table 2.2.4. Choosed functions

Item

Set-up

Count source

Input signal to TAiIN

(counting falling edges)

Input signal to TAiIN

(counting rising edges)

Timer overflow

(TB2/TAj overflow)

Count operation type

Reload type

Free-run type

Factor for switching

between up and

down

Content of up/down flag

Input signal to TAiOUT

Pulse output function

No pulses output

Pulses output

FFFF16

000016

Time

n = reload register content

(1) Start count

Count start flag

“1”

Set to “1” by software

“0”

Timer Ai interrupt

request bit

“1”

“0”

Up/down flag

“1”

“0”

Set to “1” by software

(5) Overflow

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

Start count again

(2) Underflow

(3) Switch count

Cleared to “0” by

software

(4) Stop count

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