M30620FCAFP datasheet(345/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-28

In one-shot timer mode, choose functions from those listed in Table 2.2.10. Operations of the circled

items are described below. Figure 2.2.22 shows the operation timing, and Figure 2.2.23 shows the set-up

procedure.

2.2.10 Operation of Timer A (one-shot timer mode, external trigger selected)

Figure 2.2.22. Operation timing of one-shot mode, external trigger selected

Operation

Note

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

(1) If the TAiIN pin input level changes from “L” to “H” with the count start flag set to “1”, the

counter performs a down count on the count source. At this time, the TAiOUT pin output level

goes to “H” level.

(2) If 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 of 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 2.2.10. Choosed functions

FFFF16

000116

Timer Ai interrupt

request bit

n = reload register content

Reload

(4) Stop count

One-shot pulse output

from TAiOUT pin

“H”

1 / fi X (n)

“L”

1 / fi X (n+1)

TAiIN pin

input signal

“H”

“L”

“1”

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

“0”

Count start flag

“1”

“0”

(2) Stop count

(1) Start count

(3) Start count

Time

Reload

Start count

Set to “1” by software

Trigger during count

Cleared to “0” by software

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