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TIMER A

7906 Group User’s Manual Rev.2.0

7-40

7.6 Pulse width modulation (PWM) mode

7.6.1 Setting for PWM mode

Figures 7.6.2 and 7.6.3 show an initial setting example for registers relevant to the PWM mode.

Note that when using interrupts, set up to enable the interrupts. For details, refer to “CHAPTER 6.

INTERRUPTS.”

Fig. 7.6.2 Initial setting example for registers related to PWM mode (1)

Note. When operating as 8-bit pulse width modulator

(m+1) (2 – 1)

n(m+1)

However, if n = “0016”, the pulse width modulator

does not operate and the TAjOUT pin outputs “L”

level. At this time, no timer Aj interrupt request

occurs.

Count source select bits

See Table 7.2.3.

Selecting PWM mode and each function

Timer Aj mode register (j = 0 to 2, 4, 9)

(Addresses 5616 to 5816, 5A16, DA16)

16/8-bit PWM mode select bit

0 : Operates as 16-bit pulse width modulator

1 : Operates as 8-bit pulse width modulator

Continued to Figure 7.6.3

on the next page

Trigger select bits

0 0 :

0 1 :

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

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

Selection of PWM mode

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

Can be set to “000016” to “FFFE16” (n)

(b15)

(b8)

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)

Note. When operating as 16-bit pulse width modulator

2 – 1

However, if n = “000016”, the pulse width modulator does

not operate and the TAjOUT pin outputs “L” level. At this

time, no timer Aj interrupt request occurs.

q When operating as 16-bit pulse width modulator

Can be set to “0016” to “FF16” (m)

(b15)

(b8)

q When operating as 8-bit pulse width modulator

Can be set to “0016” to “FE16” (n)

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)

Writing “1” to count start bit: Internal trigger

Period =

“H” level width =

Period =

“H” level width =

(fi : Frequency of

count source)

(fi : Frequency of count source)

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