mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 155

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
6
PWMPAIR12
PWMPAIR34
PWMPAIR56
(TOP)
(TOP)
(TOP)
OUTPUT CONTROL
(OUTCTL)
Whenever an input to a dead-time generator transitions, a dead-time is
inserted (for example, both PWMs in the pair are forced to their inactive
state). The BOTTOM PWM signal is generated from the TOP PWM and
the dead-time. In the case of output control enabled, the odd OUTx bits
control the top PWMs, the even OUTx bits control the bottom PWMs with
respect to the odd OUTx bits (see
effects of the dead-time insertion.
Examples of dead-time insertion are shown in
Figure
duty cycle boundaries (near 0% and 100% duty cycles).
shows the effects of dead-time insertion on pulse widths smaller than the
dead-time.
Pulse-Width Modulator for Motor Control (PWMMC)
Figure 9-13. Dead-Time Generators
PWM(TOP)
PWM (TOP)
OUTX
OUTX
PWM (TOP)
OUTX
PWM (TOP)
OUTX
PREDT (TOP)
PREDT (TOP)
PREDT (TOP)
PREDT(TOP)
9-16.
MUX
SELECT
SELECT
SELECT
SELECT
MUX
MUX
MUX
OUT2
OUT4
OUT6
Figure 9-15
POSTDT (TOP)
POSTDT (TOP)
POSTDT (TOP)
DEAD-TIME
DEAD-TIME
DEAD-TIME
shows the effects of dead-time insertion at the
Pulse-Width Modulator for Motor Control (PWMMC)
Table
9-4).
BOTTOM
BOTTOM
BOTTOM
(PWM1)
(PWM2)
(PWM3)
(PWM4)
(PWM5)
(PWM6)
Figure 9-14
Figure 9-14
TOP
TOP
TOP
Figure 9-16
Technical Data
shows the
Output Control
through
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
155