7906 datasheet(142/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-39

7.6 Pulse width modulation (PWM) mode

Timer Aj mode register (i = 0 to 2, 4, 9) (Addresses 5616 to 5816, 5A16, DA16)

Operating mode select bits

Fix this bit to “1” in PWM mode.

Trigger select bits

16/8-bit PWM mode select bit

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

1 1 : PWM mode

b1 b0

0 0 :

Writing “1” to count start bit

0 1 :

(TAjIN pin functions as a programmable I/O

port pin.)

1 0 : Falling edge of TAjIN pin’s input signal

1 1 : Rising edge of TAjIN pin’s input signal

b4 b3

0 : 16-bit pulse width modulator

1 : 8-bit pulse width modulator

See Table 7.2.3.

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

Undefined

15 to 0

Any value in the range from “000016” to “FFFE16” can be set.

Assuming that the set value = n, the “H” level width of the PWM pulse which is output

from the TAjOUT pin is expressed as follows :

(PWM pulse period =

)

(b15)

(b8)

fi: Frequency of count source

Note: Use the MOVM or STA(STAD) instruction for writing to this register.

Writing to this register must be performed in a unit of 16 bits.

216–1

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

Undefined

7 to 0

15 to 8

Any value in the range from “0016” to “FF16” can be set.

Assuming that the set value = m, the period of the PWM pulse which is output from the

TAjOUT pin is expressed as follows:

(b15)

(b8)

(m + 1) (28 – 1)

Any value in the range from “0016” to “FF16” can be set.

Assuming that the set value = n, the “H” level width of the PWM pulse which is output

from the TAjOUT pin is expressed as follows: n(m + 1)

fi: Frequency of count source

Note: Use the MOVM or STA(STAD) instruction for writing to this register.

Writing to this register must be performed in a unit of 16 bits.

Bit

Function

At reset

R/W

Bit name

Bit

Function

At reset

R/W

Bit

Function

At reset

R/W

Fig. 7.6.1 Structures of timer Aj register and timer Aj mode register in PWM mode

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