MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 46

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

6
The value of each PWM Data Register is continuously compared with the content of an internal
counter to determine the state of each PWM channel output pin. Double buffering is not used in
this PWM design.
6-2
M=$00
M=$01
M=$0F
M=$1F
T=1 CPU clock period (0.5 s if CPU clock=2MHz)
M = value set in 5-bit PWM (bit3-bit7)
N = value set in 3-bit BRM (bit0-bit2)
xx1
x1x
1xx
N
T
PWM cycles where pulses are inserted in a 8-cycle frame
4
2, 6
1, 3, 5, 7
Figure 6-1 8-Bit PWM Output Waveforms
PULSE WIDTH MODULATION
16T
Pulse inserted at end of PWM cycle
depends on setting of N.
32T=16 s
31T
31T
16T
pulses in a 8-cycle frame
Number of inserted
1
2
4
MC68HC05BD3
T
TPG