HD404314H 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD404314H

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

HD404318 Series

$FF + 1

Timer C

count value

$00

Overflow

Time

CPU

operation

Normal Timer C Normal Timer C

operation clear operation clear

Program

runaway

Reset

Normal

operation

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

register until the occurrence of the overflow interrupt, the PWM output differs from the period and duty

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

Free running

Timer write

register

updated to

value N

Interrupt

request

Timer Write Register is Updated during

Low PWM Output

Timer write

register

updated to

value N

Interrupt

request

Reload

T × (255 – N) T × (N + 1)

Timer write

register

updated to

value N

Interrupt

request

T × (N' + 1)

T × (255 – N) T × (N + 1)

Timer write

register

updated to

value N

Interrupt

request

T

T × (255 – N)

T

T

T × (255 – N)

T

40

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