7906 datasheet(198/531 Pages) RENESAS

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PULSE OUTPUT PORT MODE

7906 Group User’s Manual Rev.2.0

9-17

9.3 Setting of pulse output port mode

Fig. 9.3.4 Initial setting example for registers relevant to pulse output port mode (in pulse mode 1) (4)

Count source select bits

See Table 7.2.3.

Timer Aj mode register (j = 1, 2, 4) (Addresses 5716, 5816, 5A16)

16/8-bit PWM mode select bit

0 : 16-bit pulse width modulator

1 : 8-bit pulse width modulator

Setting of PWM pulse period and “H” level width

A value in the range from “000016 to FFFE16” (n) is set.

(b15)

(b8)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

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

does not operate and pin TAjOUT pin outputs “L”

level. At this time, no timer Aj interrupt request

occurs.

s When 16-bit pulse width modulator

A value in the range from “0016” to “FF16” (m) is set.

(b15)

(b8)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

s When 8-bit pulse width modulator

A value in the range from “0016” to “FE16” (n) is set.

2 – 1

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

does not operate and pin TAjOUT pin outputs “L”

level. At this time, no timer Aj interrupt request

occurs.

“H” level width =

fi : Frequency of count source

Period =

✽ When operating as 16-bit pulse width modulator

(m + 1)(2 – 1)

✽ When operating as 8-bit pulse width modulator

“H” level width =

fi : Frequency of count source

Period =

n (m + 1)

From preceding “Figure 9.3.3”

Continue to “Figure 9.3.5.”

When pulse width modulation is not performed

When pulse width modulation is performed

j = 1, 2 : Fix this bit to “0.”

j = 4 : When not using pin TA4OUT (in other words, when using pin

P20 as a programmable I/O port pin), clear this bit to “0.”

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