M30620FCAFP datasheet(347/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-30

In pulse width modulation mode, choose functions from those listed in Table 2.2.11. Operations of the

circled items are described below. Figure 2.2.24 shows the operation timing, and Figure 2.2.25 shows the

set-up procedure.

2.2.11 Operation of Timer A (pulse width modulation mode, 16-bit PWM mode selected)

Figure 2.2.24. Operation timing of pulse width modulation mode, 16-bit PWM mode selected

Item

Count source

PWM mode

Count start condition

Set-up

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

16-bit PWM

8-bit PWM

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)

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

Table 2.2.11. Choosed functions

(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. Also, the TAiOUT pin outputs an “H” level.

(2) The TAiOUT pin output level changes from “H” to “L” when a set time period elapses. At this

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

(3) The counter reloads the content of the reload register every time PWM pulses are output for

one cycle, and continues counting.

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

TAiOUT outputs an “L” level.

• The period of PWM pulses becomes (216 – 1)/fi, and the “H” level pulse width becomes n/fi. If

the timer Ai register is set to “000016”, the pulse width modulator does not work, and the

TAiOUT pin outputs “L” level, therefore the timer Ai interrupt request is not generated.

(fi : frequency of the count source f1, f8, f32, fC32;

n : value of the timer)

Operation

Note

Count source

TAiIN pin

input signal

PWM pulse output

from TAiOUT pin

Timer Ai interrupt

request bit

Count start flag

1 / fi X (2

–1)

Conditions: Reload register = 000316, external trigger (rising edge of TAiIN pin input signal) is selected

Trigger is not generated by this signal

“H”

“L”

“1”

“0”

Cleared to “0” when interrupt request is

accepted, or cleared by software

1 / fi X n

“1”

“0”

Set to “1” by software

(1) Start count

(2) Output level “H” to “L”

Note: n = 000016 to FFFE16

(3) One period is complete

(4) Stop count

Cleared to “0”

by software

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