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TIMER A

7733 Group User’s Manual

6–43

6.6.1 Setting for PWM mode

Figures 6.6.2 and 6.6.3 show an initial setting example for registers related to the PWM mode.

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

INTERRUPTS.”

6.6 Pulse width modulation (PWM) mode

Fig. 6.6.2 Initial setting example for registers related to PWM mode (1)

Count source selection bits

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

Selection of PWM mode and each function

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

b7 b6

16/8-bit PWM mode selection bit

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

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

Continued to

“Initial setting example for registers related to PWM mode (2)”

on the next page

Trigger selection bits

0 X: Writing “1” to the count 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

b4 b3

X: It may be “0” or “1.”

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

GENERATING CIRCUIT.”

PWM mode selected

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

Values 000016 to FFFE16 (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 When operating as a 16-bit pulse width modulator

Period = (216 – 1)/fi

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

However, if n = 000016, the pulse width modulator does not

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

Ai interrupt request is generated.

sWhen operating as a 16-bit pulse width modulator

Values 0016 to FF16 (m) can be set.

(b15)

(b8)

sWhen 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 (f2, f16, f64, or f512)

However, if n = 0016, the pulse width modulator does not

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

timer Ai interrupt request is generated.

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)

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