7733 datasheet(145/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–34

6.5.1 Setting for one-shot pulse mode

Figures 6.5.2 and 6.5.3 show an initial setting example for registers related to the one-shot pulse mode.

Note that when using interrupts, setting for enabling interrupts is required. For details, refer to chapter “4.

INTERRUPTS.”

6.5 One-shot pulse mode

Fig. 6.5.2 Initial setting example for registers related to one-shot pulse mode (1)

Continued to

“Initial setting example for registers related to one-shot pulse mode (2)”

on the next page

Setting of the interrupt priority level

Timer Ai interrupt control register

(addresses 7516 to 7916)

Interrupt priority level selection bits

When using interrupts, one of levels 1 to 7 must be set.

When disabling interrupts, level 0 must be set.

Selection of the one-shot pulse mode and each function

Timer Ai mode register (i = 0 to 4) (addresses 5616 to 5A16)

b4 b3

Trigger selection bits

0 X: Writing “1” to the one-shot start flag: Internal trigger

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

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

b7 b6

Count source selection bits

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

X: It may be “0” or “1.”

Clocks f2, f16, f64, and f512: Refer to chapter “14. CLOCK

GENERATING CIRCUIT.”

One-shot pulse mode is selected.

Setting of the one-shot pulse’s “H” level width

Values 000016 to FFFF16 (n) can be set.

(b15)

(b8)

Timer A0 register (addresses 4716, 4616)

Timer A1 register (addresses 4916, 4816)

Timer A2 register (addresses 4B16, 4A16)

Timer A3 register (addresses 4D16, 4C16)

Timer A4 register (addresses 4F16, 4E16)

g “H” level width = n/fi

fi = Frequency of the count source (f2, f16, f64, or f512)

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

pin TAiOUT outputs “L” level. At this time, no timer Ai

interrupt request is generated.

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