HD404629R Datasheet, PDF (83/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R Series
Note on Use
When using the timer output as PWM output, note the following point. From the update of the timer write
register untill the occurrence of the overflow interrupt, the PWM output differs from the period and duty
settings, as shown in table 27. 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 27 PWM Output Following Update of Timer Write Register
Mode
Free
running
PWM Output
Timer Write Register is Updated
during High PWM Output
Timer Write Register is Updated
during Low PWM Output
Timer write
register
rewrite (set
value is N)
Interrupt request
generated
Timer write
register
rewrite (set
value is N)
Interrupt request
generated
Reload
T × (255 – N) T × (N + 1)
Timer write
register
rewrite (set
value is N)
Interrupt request
generated
T × (N' + 1)
T × (255 – N) T × (N + 1)
Timer write
register
rewrite (set
value is N)
Interrupt request
generated
T
T × (255 – N)
T
T
T × (255 – N)
T
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