M30620FCAFP datasheet(513/615 Pages) RENESAS

513 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-196

Timer A Applications

In this process, Timer A0 and A1 are used to generate variable-period, variable-duty PWM out-

put. Figure 3.2.1 shows the operation timing, Figure 3.2.2 shows the connection diagram, and

Figures 3.2.3 and 3.2.4 show the set-up procedure.

Use the following peripheral functions:

• Timer mode of timer A

• One-shot timer mode of timer A

(1) Set timer A0 in timer mode, and set timer A1 in one-shot timer mode with pulse-output function.

(2) Set 1 ms, the PWM period, to timer A0. Set 500

µs, the width of PWM “H” pulse, to timer A1.

Both timer A0 and timer A1 use f1 for the count source.

(3) Connect a 16-MHz oscillator to XIN.

(1) Setting the count start flag to “1” causes the counter of timer A0 to begin counting. The

counter of timer A0 performs a down count on count source f1.

(2) If the counter of timer A0 underflows, the counter reloads the content of the reload register

and continues counting. At this time, the timer A0 interrupt request bit goes to “1”.

(3) An underflow in timer A0 triggers the counter of timer A1 and causes it to begin counting. When

the counter of timer A1 begins counting, the output level of the TA1OUT pin goes to “H”.

(4) As soon as the count of the counter of timer A1 becomes “000016”, the output level of TA1OUT

pin goes to “L”, and the counter reloads the content of the reload register and stops counting.

At the same time, the timer A1 interrupt request bit goes to “1”.

3.2 Variable-Period Variable-Duty PWM Output

Overview

Specifications

Operation

M30620FCAFP Datasheet(PDF) 513 Page - Renesas Technology Corp