mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 389

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

To calculate the output frequency in center aligned output mode for a particular channel, take the selected
clock source frequency for the channel (A, B, SA, or SB) and divide it by twice the value in the period
register for that channel.
Freescale Semiconductor
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PWMx Frequency = Clock (A, B, SA, or SB) / (2*PWMPERx)
PWMx Duty Cycle (high time as a% of period):
— Polarity = 0 (PPOLx = 0)
Duty Cycle = [(PWMPERx-PWMDTYx)/PWMPERx] * 100%
— Polarity = 1 (PPOLx = 1)
Duty Cycle = [PWMDTYx / PWMPERx] * 100%
MC9S12XDP512 Data Sheet, Rev. 2.17
Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)
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