Freescale Semiconductor, Inc.
Pulse Width Modulator
13.4 PWM Boundary Cases
The boundary conditions for the PWM channel duty registers and the
PWM channel period registers cause these results:
Table 13-2. PWM Left-Aligned Boundary Conditions
PWDTYx
PWPERx
>$00
>$00
–
PPOLx
Output
Low
High
High
Low
$FF
$FF
1
0
1
0
1
0
≥PWPERx
≥PWPERx
–
–
–
$00
$00
High
Low
Table 13-3. PWM Center-Aligned Boundary Conditions
PWDTYx
PWPERx
>$00
>$00
–
PPOLx
Output
Low
High
High
Low
$00
$00
≥PWPERx
≥PWPERx
1
0
1
0
1
0
–
$00
$00
–
–
High
Low
Advance Information
196
68HC(9)12D60 — Rev 4.0
MOTOROLA
Pulse Width Modulator
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