MC68HC908BD48 Datasheet, PDF (152/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Pulse Width Modulator (PWM)
M = $00
T
M = $01
1 PWM cycle = 32T
31 T
M = $0F
16 T
16 T
M = $1F
31 T
Pulse inserted at end of PWM cycle
depends on setting of N.
T
T=1 CPU clock period (0.167µs if CPU clock=6MHz)
M = value set in 5-bit PWM (bit3-bit7)
N = value set in 3-bit BRM (bit0-bit2)
N
PWM cycles where pulses are Number of inserted pulses
inserted in a 8-cycle frame
in a 8-cycle frame
xx1
4
1
x1x
2, 6
2
1xx
1, 3, 5, 7
4
Figure 11-3. 8-Bit PWM Output Waveforms
Technical Data
152
Pulse Width Modulator (PWM)
MC68HC908BD48 — Rev. 1.0
MOTOROLA