7721 datasheet(150/577 Pages) RENESAS

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TIMER A

7721 Group User’s Manual

8–31

8.5 One-shot pulse mode

8.5.1 Setting for one-shot pulse mode

Figures 8.5.2 and 8.5.3 show an initial setting example for registers relevant to the one-shot pulse mode.

Note that when using interrupts, set up to enable the interrupts. For details, refer to

“CHAPTER 7.

INTERRUPTS.”

Fig. 8.5.2 Initial setting example for registers relevant to one-shot pulse mode (1)

Continue to Figure 8.5.3.

Setting interrupt priority level

Timer Aj interrupt control register (j = 2 to 4)

(Addresses 7716 to 7916)

Interrupt priority level select bits

When using interrupts, set these bits to one of levels 1 to 7.

When disabling interrupts, set these bits to level 0.

Selecting one-shot pulse mode and each function

Timer Aj mode register (j = 2 to 4) (Addresses 5816 to 5A16)

Trigger select bits

0 0 :

0 1 :

1 0 : Falling edge of TAjIN pin’s input signal: External trigger

1 1 : Rising edge of TAjIN pin’s input signal: External trigger

b4 b3

Count source select bits

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Selection of one-shot pulse mode

Setting “H” level width of one-shot pulse

Can be set to “000116” to “FFFF16” (n).

(b15)

(b8)

Timer A2 register (Addresses 4B16, 4A16)

Timer A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

“H” level width =

Writing “1” to one-shot start bit: Internal trigger

Note.

fi: Frequency of count source

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