7733 datasheet(153/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–42

6.6 Pulse width modulation (PWM) mode

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

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

b7 b6

Count source selection bits

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

At reset

Trigger selection bits

Must be fixed to “1” in the PWM mode.

Operating mode selection

bits

Bit name

Functions

1 1: PWM mode

b1 b0

b4 b3

16/8-bit PWM mode

selection bit

0 X: Writing “1” to the count start flag (Pin TAiIN

functions as a programmable I/O port.)

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

1 1: Rising edge of the pin TAiIN’s input signal

Bit

0: The counter operates as a 16-bit pulse

width modulator.

1: The counter operates as an 8-bit pulse

width modulator.

s When operating as an 8-bit pulse width modulator

(b15)

b0 b7

(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)

Functions

Bit

At reset

7 to 0

Values 0016 to FF16 can be set.

Assuming that the set value = m, period of

the PWM pulse which is output from pin

TAiOUT is (m + 1)(28 – 1)/fi.

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

15 to 8 Values 0016 to FE16 can be set.

Assuming that the set value = n, “H” level

width of the PWM pulse which is output from

pin TAiOUT is n(m +1)/fi.

Un-

defined

Un-

defined

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)

Functions

Bit

At reset

15 to 0 Values 000016 to FFFE16 can be set.

Assuming that the set value = n, “H” level

width of the PWM pulse which is output from

pin TAiOUT is n/fi.

Un-

defined

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

s When operating as a 16-bit pulse width modulator

(b15)

(b8)

Fig. 6.6.1 Structures of timer Ai mode register and timer Ai register in PWM mode

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