MC68HC711K4CFN4 Datasheet, PDF (78/80 Pages) Motorola, Inc – 8-Bit Microcontroller

PWPER1–PWPER4 —Pulse-Width Modulation Timer Period 1 to 4
$0068 Bit 7
6
5
4
3
2
1
$0069 Bit 7
6
5
4
3
2
1
$006A Bit 7
6
5
4
3
2
1
$006B Bit 7
6
5
4
3
2
1
RESET:
1
1
1
1
1
1
1
PWPER1–PWPER4
Determines period of associated PWM channel
PWDTY1–4 —Pulse-Width Modulation Timer Duty Cycle 1 to 4
Bit 7
6
5
4
3
2
1
$006C Bit 7
6
5
4
3
2
1
$006D Bit 7
6
5
4
3
2
1
$006E Bit 7
6
5
4
3
2
1
$006F Bit 7
6
5
4
3
2
1
RESET:
1
1
1
1
1
1
1
PWDTY1–4
Determines duty cycle of associated PWM channel
$0068–$006B
Bit 0
Bit 0
Bit 0
Bit 0
1
PWPER1
PWPER2
PWPER3
PWPER4
$006C–$006F
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
1
PWDTY1
PWDTY2
PWDTY3
PWDTY4
12.1 PWM Boundary Cases
Certain values written to PWM control registers, counters, etc. can cause outputs that are not what the
user might expect. These are referred to as boundary cases. Boundary cases occur when the user
specifies a value that is either a maximum or a minimum. This value combined with other conditions
causes unexpected behavior of the PWM system.
The following conditions always cause the corresponding output to be high:
PWDTYx = $00, PWPERx > $00, and PPOLx = 0
PWDTYx ≥PWPERx, and PPOLx = 1
PWPERx = $00 and PPOLx = 1
The following conditions always cause the corresponding output to be low:
PWDTYx = $00, PWPERx > $00, and PPOLx = 1
PWDTYx ≥PWPERx, and PPOLx = 0
PWPERx = $00 and PPOLx = 0
MOTOROLA
78
M68HC11 K Series
MC68HC11TS/D