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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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Divide by<br />

Prescaler Taps:<br />

Bus Clock<br />

PFRZ<br />

Freeze Mode Signal<br />

128<br />

2 4 8 16 32 64<br />

PWME7-0<br />

PCKA2<br />

PCKA1<br />

PCKA0<br />

M<br />

U<br />

X<br />

M<br />

U<br />

X<br />

PCKB2<br />

PCKB1<br />

PCKB0<br />

8-Bit Down<br />

Counter<br />

PWMSCLA<br />

8-Bit Down<br />

Counter<br />

PWMSCLB<br />

Prescale Scale<br />

Clock A<br />

Clock A/2, A/4, A/6,....A/512<br />

Count = 1<br />

Clock B<br />

Figure 9-15. PWM Clock Select Block Diagram<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

Pulse-Width Modulator (S12PWM8B8CV2)<br />

Clock SA<br />

Clock Select<br />

<strong>Freescale</strong> <strong>Semiconductor</strong> 293<br />

Load<br />

Load<br />

DIV 2<br />

Clock B/2, B/4, B/6,....B/512<br />

Count = 1<br />

DIV 2<br />

Clock SB<br />

M UX<br />

PCLK0 PCLKAB0<br />

M UX<br />

PCLK1 PCLKAB1<br />

M UX<br />

PCLK2 PCLKAB2<br />

M UX<br />

PCLK3 PCLKAB3<br />

M UX<br />

PCLK4 PCLKAB4<br />

M UX<br />

PCLK5 PCLKAB5<br />

M UX<br />

PCLK6 PCLKAB6<br />

M UX<br />

PCLK7 PCLKAB7<br />

Clock to<br />

PWM Ch 0<br />

Clock to<br />

PWM Ch 1<br />

Clock to<br />

PWM Ch 2<br />

Clock to<br />

PWM Ch 3<br />

Clock to<br />

PWM Ch 4<br />

Clock to<br />

PWM Ch 5<br />

Clock to<br />

PWM Ch 6<br />

Clock to<br />

PWM Ch 7<br />

Maximum possible channels, scalable in pairs from PWM0 to PWM7.

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