mc68hc11k4vfu4 Freescale Semiconductor, Inc, mc68hc11k4vfu4 Datasheet - Page 78

• Manufacturer Part Number: mc68hc11k4vfu4
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

PWPER1–PWPER4 —Pulse-Width Modulation Timer Period 1 to 4
PWPER1–PWPER4
PWDTY1–4 —Pulse-Width Modulation Timer Duty Cycle 1 to 4
PWDTY1–4
12.1 PWM Boundary Cases
78
MOTOROLA
RESET:
RESET:
$006A
$006B
$006C
$006D
$006E
$006F
$0068
$0069
Determines period of associated PWM channel
Determines duty cycle of associated PWM channel
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
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
1
1
6
6
6
6
1
6
6
6
6
6
1
5
5
5
5
1
5
5
5
5
5
1
4
4
4
4
1
4
4
4
4
4
1
3
3
3
3
1
3
3
3
3
3
1
2
2
2
2
1
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
1
1
$006C–$006F
$0068–$006B
PWPER1
PWPER2
PWPER3
PWPER4
PWDTY1
PWDTY2
PWDTY3
PWDTY4
M68HC11 K Series
MC68HC11TS/D