M30620FCAFP datasheet(343/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-26

2.2.9 Operation of Timer A (one-shot timer mode)

Figure 2.2.20. Operation timing of one-shot mode

In one-shot timer mode, choose functions from those listed in Table 2.2.9. Operations of the circled items

are described below. Figure 2.2.20 shows the operation timing, and Figure 2.2.21 shows the set-up

procedure.

Operation

Note

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

(1) Setting the one-shot start flag to “1” with the count start flag set to “1” causes the counter to

perform a down count on the count source. At this time, the TAiOUT pin outputs an “H” level.

(2) The instant the value of the counter becomes “000016”, the TAiOUT pin outputs an “L” level,

and the counter reloads the content of the reload register and stops counting. At this time, the

timer Ai interrupt request bit goes to “1”.

(3) If a trigger occurs while a count is in progress, the counter reloads the value in the reload

input after the trigger.

(4) Setting the count start flag to “0” causes the counter to stop and to reload the content of the

reload register. Also, the TAiOUT pin outputs an “L” level. At this time, the timer Ai interrupt

request bit goes to “1”.

• When the timer Ai register is set to “000016”, the counter does not operate and the timer Ai

interrupt request is not generated. When the pulse is set to output, the pulse does not output

from the TAiOUT pin.

Item

Count source

Pulse output function

Count start condition

Set-up

Internal count source (f1 / f8 / f32 / fc32)

No pulses output

Pulses output

External trigger input (falling edge of input signal to the TAiIN pin)

External trigger input (rising edge of input signal to the TAiIN pin)

Timer overflow (TB2/TAj/TAk overflow)

Writing “1” to the one-shot start flag

Table 2.2.9. Choosed functions

FFFF16

000116

Timer Ai interrupt

request bit

n = reload register content

Reload

One-shot pulse output

from TAiOUT pin

“H”

1 / fi X (n)

“L”

Time

Reload

1 / fi X (n+1)

Write signal to

one-shot start flag

“1”

“0”

Count start flag

“1”

“0”

(1) Start count

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

(2) Stop count

(3) Start count

(4) Stop count

Start count

Reload

Set to “1” by software

Cleared to “0” by software

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