7906 datasheet(200/531 Pages) RENESAS

200 / 531 page

PULSE OUTPUT PORT MODE

7906 Group User’s Manual Rev.2.0

9-19

9.4 Pulse output port mode operation

9.4.1 Pulse output trigger

(1) RTP00 to RTP03 in pulse mode 0, Pulse mode 1

The pulse output trigger can be selected from an internal trigger and an external trigger.

When the pulse output trigger select bits (bits 7, 6 at address A816) = “002,” an internal trigger is

selected; when these bits = “012,” “102,” or “112,” an external trigger is selected.

s Internal trigger

A trigger occurs at an underflow of timer A0. This trigger occurrence can be confirmed by using

the timer A0 interrupt request bit.

s External trigger

A trigger occurs at a valid edge input to pin RTPTRG0 (Note). This trigger occurrence can be confi-

rmed by using the INT3 interrupt request bit. Table 9.4.1 lists the setting of INT3 according to valid

edges.

Also, the allocation of pin RTPTRG0 can be changed by the pin INT3/RTPTRG0 select bit (bit 3 at

address AE16).

Be sure to clear the port direction register’s bit, corresponding to pin RTPTRG0, to “0” in order to

set the port pin to the input mode.

Note: This is set by the pulse output trigger select bits (bits 7, 6 at address A816).

(2) RTP10, RTP11 in pulse mode 0

The pulse output trigger is an internal trigger.

A trigger occurs at an underflow of timer A3. This trigger occurrences can be confirmed by using the

timer A3 interrupt request bit.

Note: Refer to section “6.10 External interrupts.”

Valid edge input to pin RTPTRG0

Setting of INT3 (Note)

Falling

Rising

Falling and Rising

Falling (edge sense)

Rising (edge sense)

Falling and Rising (edge sense): used alternately

Table 9.4.1 Setting of INT3 according to valid edges

7906 Datasheet(PDF) 200 Page - Renesas Technology Corp