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TIMER A

7906 Group User’s Manual Rev.2.0

7-31

7.5.1 Setting for one-shot pulse mode

Figures 7.5.2 and 7.5.3 show an initial setting example for registers related to the one-shot pulse mode.

Note that when using interrupts, set up to enable the interrupts. For details, refer to “CHAPTER 6.

INTERRUPTS.”

7.5 One-shot pulse mode

Fig. 7.5.2 Initial setting example for registers related to one-shot pulse mode (1)

Continued to Figure 7.5.3

on the next page

Setting interrupt priority level

Timer Aj interrupt control register (j = 0 to 2, 4, 9)

(Addresses 7516 to 7716, 7916, F916)

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 = 0 to 2, 4, 9)

(Addresses 5616 to 5816, 5A16, DA16)

Trigger select bits

0 0 :

0 1 :

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

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

b4 b3

Count source select bits

See Table 7.2.3.

Selection of one-shot pulse mode

Setting “H” level width of one-shot pulse

Can be set to “000016” to “FFFF16” (n).

(b15)

(b8)

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

“H” level width =

fi = Frequency of count source

However, if n = “000016”, the counter does not operate and the

TAjOUT pin outputs “L” level. At this time, no timer Aj interrupt

request occurs.

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

Note.

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