7733 datasheet(533/940 Pages) RENESAS

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EXTERNAL ROM VERSION

7733 Group User’s Manual

20–17

20.7 Timer A

Fig. 20.7.4 Structures of timer A1, A3 mode registers and timer A1, A3 registers in pulse output port

mode (when pulse width modulation function is used)

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

Count source selection bits

b7 b6

Note: Fix bit 2 to “1” and bit 4 to “0” even when not using the pulse width modulation function.

X: It may be “0” or “1.”

At reset

Trigger selection bits

Must be fixed to “1” in the PWM mode. ( Note)

Operating mode selection

bits

Bit name

Functions

1 1: PWM mode

b1 b0

b4 b3

16/8-bit PWM mode

selection bit

Writing “1” to the count start flag

(Pin TAiIN functions as a programmable

I/O port.)

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)

(b8)

Timer A1 register (addresses 49 16, 4816)

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

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

TA1OUT or TA3OUT is (m + 1)(28 – 1)/fi.

fi: Frequency of the count source (f 2, 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 TA1 OUT or TA3OUT is n(m +1)/fi.

Undefined

Timer A1 register (addresses 49 16, 4816)

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

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 TA1OUT or TA3OUT is n/fi.

Undefined

fi: Frequency of the count source (f 2, f16, f64, or f512)

s When operating as a 16-bit pulse width modulator

(b15)

(b8)

Timer A1 mode register (address 57 16)

Timer A3 mode register (address 59 16)

0 !

(Note)

0 0:

0 1:

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