HS4318ESS01H datasheet(42/68 Pages) RENESAS

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HD404318 Series

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Timer C

count value

Overflow

Time

CPU

operation

Normal

operation

Timer C

clear

Normal

operation

Timer C

clear

Program

runaway

Normal

operation

Reset

Figure 31 Watchdog Timer Operation Flowchart

Notes on Use

When using the timer output as PWM output, note the following point. From the update of the timer write

settings, as shown in table 8. The PWM output should therefore not be used until after the overflow

interrupt following the update of the timer write register. After the overflow, the PWM output will have the

set period and duty cycle.

Table 8

PWM Output Following Update of Timer Write Register

PWM Output

Mode

Timer Write Register is Updated during

High PWM Output

Timer Write Register is Updated during

Low PWM Output

Free running

Timer write

updated to

value N

Interrupt

request

× (255 – N) T × (N + 1)

Timer write

updated to

value N

Interrupt

request

× (N' + 1)

× (255 – N) T × (N + 1)

Reload

Timer write

updated to

value N

Interrupt

request

× (255 – N)

Timer write

updated to

value N

Interrupt

request

× (255 – N)

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