7733 datasheet(537/940 Pages) RENESAS

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EXTERNAL ROM VERSION

7733 Group User’s Manual

20–21

20.7 Timer A

Fig. 20.7.8 Initial setting example for registers related to pulse output port mode (2)

Continued from

"Initial setting example for registers related to

pulse output port mode (1)"

on the preceding page

Timer A1 mode register

(address 5716)

Timer A3 mode register

(address 5916)

Setting of the timer A1 mode register or timer A3 mode register

Setting of the PWM pulse’s period and “H” level width

Values 000016 to FFFE16 (n) can be set.

(b15)

(b8)

Timer A1 register (addresses 49 16, 4816)

Timer A3 register (addresses 4D 16, 4C16)

sWhen operating as a 16-bit pulse width modulator

Values 0016 to FF16 (m) can be set.

(b15)

(b8)

When operating as an 8-bit pulse width modulator

Values 0016 to FE16 (n) can be set.

g When operating as an 8-bit pulse width modulator

Period = (m+1) (28 – 1)/fi

“H” level width = n(m + 1)/fi

fi: Frequency of the count source

However, if n = 0016, the counter does not operate

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

timer Ai request is generated.

Timer A1 register (addresses 49 16, 4816)

Timer A3 register (addresses 4D 16, 4C16)

Setting of timers A1 and A3

Timer A1 mode register (address 57 16)

Timer A3 mode register (address 59 16)

b4 b3

Trigger selection bits

0 X: Count start flag

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.”

16/8-bit PWM mode selection bit

0: The counter operates as a 16-bit pulse width modulator.

1: The counter operates as an 8-bit pulse width modulator.

Continued to

“Initial setting example for registers related to pulse output port mode (3)”

on the next page

When not modulating

the pulse width

When modulating the pulse width

g When operating as a 16-bit pulse width modulator

Period = (216 – 1)/fi

“H” level width = n/fi

fi: Frequency of the count source

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

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

Ai request is generated.

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