Specifications

Section 43. High-Speed PWM

High-Speed PWM

bit 7-6 DTC<1:0>: Dead Time Control bits

(3)

11 = Dead time Compensation mode

10 = Dead time function is disabled

01 = Negative dead time actively applied for all output modes

00 = Positive dead time actively applied for all output modes

bit 5 DTCP: Dead-Time Compensation Polarity bit

(3,6)

When set to ‘1’:

If DTCMPx = 0, PWMxL is shortened and PWMxH is lengthened.

If DTCMPx = 1, PWMxH is shortened and PWMxL is lengthened.

When set to ‘

0’:

If DTCMPx = 0, PWMxH is shortened and PWMxL is lengthened.

If DTCMPx = 1, PWMxL is shortened and PWMxH is lengthened.

bit 4 Unimplemented: Read as ‘0’

bit 3 MTBS: Master Time Base Select bit

1 = PWM generator uses the secondary master time base for synchronization and as the clock source

for the PWM generation logic (if secondary time base is available)

0 = PWM generator uses the primary master time base for synchronization and as the clock source

for the PWM generation logic

bit 2 CAM: Center-aligned Mode Enable bit

(2,3,5)

1 = Center-aligned mode is enabled

0 = Edge-aligned mode is enabled

bit 1 XPRES: External PWM Reset Control bit

(4)

1 = Current-limit source resets the time base for this PWM generator if it is in Independent Time Base

mode

0 = External pins do not affect PWM time base

bit 0 IUE: Immediate Update Enable bit

1 = Updates to the active MDC/PDCx/SDCx registers are immediate

0 = Updates to the active MDC/PDCx/SDCx registers are synchronized to the local PWM time base

Note 1: Software must clear the interrupt status, and the corresponding IFS bit in the Interrupt Controller.

2: The Independent Time Base mode (ITB = 1) must be enabled to use Center-Aligned mode. If ITB = 0, the

CAM bit is ignored.

3: These bits should not be changed after the PWM is enabled (PTEN = 1).

4: Configure FCLCON

X<8> = 0 and PWMCONX<9> = 1, to operate in External Period Reset mode.

5: Center-aligned mode ignores the Least Significant 3 bits of the duty cycle, phase and dead time registers.

The highest CAM resolution available is 8.32 ns with the clock prescaler set to the fastest clock.

6: DTC<1:0> = 11 for DTCP to be effective; otherwise, DTCP is ignored.