mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 141

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

9.4 Timebase
9.4.1 Resolution
MC68HC908MR24 — Rev. 4.1
Freescale Semiconductor
This section provides a discussion of the timebase.
In center-aligned mode, a 12-bit up/down counter is used to create the
PWM period. Therefore, the PWM resolution in center-aligned mode is
two clocks (highest resolution is 250 ns @ f
Figure
register to determine its maximum count. The PWM period will equal:
[(timer modulus) x (PWM clock period) x 2].
Pulse-Width Modulator for Motor Control (PWMMC)
UP/DOWN COUNTER
9-3. The up/down counter uses the value in the timer modulus
Figure 9-3. Center-Aligned PWM (Positive Polarity)
MODULUS = 4
PWM = 0
PWM = 1
PWM = 2
PWM = 3
PWM = 4
Pulse-Width Modulator for Motor Control (PWMMC)
PERIOD = 8 x (PWM CLOCK PERIOD)
op
= 8 MHz) as shown in
Advance Information
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