7702 datasheet(129/217 Pages) RENESAS

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TIMER A

7702/7703 Group User’s Manual

5–41

5.6 Pulse width modulation (PWM) mode

5.6.1 Setting for PWM mode

Figures 5.6.2 and 5.6.3 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 4. INTERRUPTS.”

Fig. 5.6.2 Initial setting example for registers relevant to PWM mode (1)

Note: When operating as 8-bit pulse width modulator

(m+1) (28 – 1)

n(m+1)

fi : Frequency of count source

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

does not operate and the TAiOUT pin outputs “L”

level. At this time, no timer Ai request occurs.

Count source select bits

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

Selecting PWM mode and each function

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

b7 b6

16/8-bit PWM mode select bit

0 : Operates as 16-bit pulse width modulator

1 : Operates as 8-bit pulse width modulator

Continue to Figure 5.6.3.

Trigger select bits

0 0 :

0 1 :

1 0 : Falling of TAiIN pin’s input signal

1 1 : Rising of TAiIN pin’s input signal

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 A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

Note: When operating as 16-bit pulse width modulator

(216 – 1)

fi : Frequency of count source

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

not operate and the TAiOUT pin outputs “L” level. At this time,

no timer Ai 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 A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

Writing “1” to count start bit: Internal trigger

: External trigger

Period =

“H” level width =

Period =

“H” level width =

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