7702 datasheet(131/217 Pages) RENESAS

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TIMER A

7702/7703 Group User’s Manual

5–43

5.6 Pulse width modulation (PWM) mode

5.6.2 Count source

In the PWM mode, the count source select bits (bits 6 and 7 at addresses 5616 to 5A16) select the count

source. Table 5.6.2 lists the count source frequency.

Table 5.6.2 Count source frequency

Count source

select bits

Count source frequency

f(XIN) = 8 MHz

f(XIN) = 16 MHz

f(XIN) = 25 MHz

4 MHz

8 MHz

12.5 MHz

500 kHz

1 MHz

1.5625 MHz

125 kHz

250 kHz

390.625 kHz

15625 Hz

31250 Hz

48.8281 kHz

Count source

f16

f64

f512

5.6.3 Trigger

When a trigger is generated, the TAiOUT pin starts outputting PWM pulses. An internal or an external trigger

can be selected as that trigger.

An internal trigger is selected when the trigger select bits (bits 4 and 3 at addresses 5616 to 5A16) are “002”

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

A trigger generated during outputting of PWM pulses is ignored and it does not affect the pulse output

operation.

(1) When selecting internal trigger

A trigger is generated when writing “1” to the count start bit (at address 4016).

(2) When selecting external trigger

A trigger is generated at the falling of the TAiIN pin’s input signal when bit 3 at addresses 5616 to 5A16

is “0,” or at its rising when bit 3 is “1.” However, the trigger input is accepted only when the count

start bit is “1.”

When using an external trigger, set the port P5 and P6 direction registers’ bits which correspond to

the TAiIN pins for the input mode.

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