M30620FCAFP datasheet(517/615 Pages) RENESAS

517 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-200

Timer A Applications

The following are steps of outputting a pulse only once after a specified elapse since an external

trigger is input. Figure 3.3.1 shows the operation timing, Figure 3.3.2 shows the connection dia-

gram, and Figures 3.3.3 and 3.3.4 show the set-up procedure.

Use the following peripheral function:

• One-shot timer mode of timer A

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

output function.

(2) Set 1 ms, an interval before a pulse is output, in timer A0; and set 50

µs, a pulse width, in 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 trigger select bit to “1” and setting the count start flag to “1” enables the counter of

timer A0 to count.

(2) If an effective edge, selected by use of the external trigger select bit, is input to the TA0IN pin,

the counter begins a down count. The counter of timer A0 performs a down count on count

source f1.

(3) As soon as the counter of timer A0 becomes “000016”, the counter reloads the content of the

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

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

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

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

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

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

3.3 Delayed One-Shot Output

Overview

Specifications

Operation

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