7733 datasheet(157/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–46

6.6.3 Trigger

When a trigger occurs, pin TAiOUT starts the PWM pulse output. An internal or external trigger can be

selected as this trigger.

An internal trigger is selected when the trigger selection bits (bits 4 and 3 at addresses 5616 to 5A16) are

“002” or “012”; an external trigger is selected when the trigger selection bits are “102” or “112.”

A trigger generated during PWM pulse output is invalid and does not affect the pulse output operation.

(1) When internal trigger is selected

A trigger is generated when the count start flag (address 4016) is set to “1.”

(2) When external trigger is selected

A trigger is generated at the falling edge of the pin TAiIN’s input signal when bit 3 at addresses 5616

to 5A16 = “0” or at the rising edge of the pin TAiIN’s input signal when bit 3 = “1.” However, a trigger

input is accepted only when the count start flag = “1.”

When using an external trigger, set the port P5 or P6 direction register’s bit which corresponds to pin

TAiIN for the input mode.

6.6 Pulse width modulation (PWM) mode

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