M16CSLASH62 datasheet(471/621 Pages) RENESAS

471 / 621 page

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

456

Timer A Applications

3.1 Long-Period Timers

Overview

Specifications

Operation

Figure 3.1.1. Operation timing of long-period timers

In this process, Timer A0 and Timer A1 are connected to make a 16-bit timer with a 16-bit

prescaler. Figure 3.1.1 shows the operation timing, Figure 3.1.2 shows the connection dia-

gram, and Figures 3.1.3 and 3.1.4 show the set-up procedure.

Use the following peripheral functions:

• Timer mode of timer A

• Event counter mode of timer A

(1) Set timer A0 to timer mode, and set timer A1 to event counter mode.

(2) Perform a count on count source f1 using timer A0 to count for 1 ms, and perform a count

on timer A0 using timer A1 to count for 1 second.

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

(1) Setting the count start flag to “1” causes the counter 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”. The

counter of timer A1 performs a down count on underflows in timer A0.

(3) If the counter of timer A1 underflows, the counter reloads the content of the reload register

and continues counting. At this time, the timer A1 interrupt request bit goes to “1”.

FFFF16

000016

l = reload register content

Timer A1 count

start flag

“1”

“0”

Timer A1 interrupt

request bit

“1”

“0”

Timer A0 interrupt

request bit

“1”

“0”

Timer A0 count

start flag

“1”

“0”

000016

FFFF16

Time

(1) Start count

Start count.

Time

n = reload register content

Set to “1” by software

Cleard “0” by software

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

(2) Timer A0 underflow

(3) Timer A1 underflow

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