mc68hc11c0 Freescale Semiconductor, Inc, mc68hc11c0 Datasheet - Page 56

• Manufacturer Part Number: mc68hc11c0
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

PWDTY1–PWDTY2 — Pulse-Width Modulation Timer Duty Cycle 1 to 2 $006E–$006F
PWDTY1–PWDTY2
9.1 PWM Boundary Cases
56
MOTOROLA
RESET:
$006E
$006F
Determines duty cycle of associated PWM channel
Duty cycle registers can be written any time. A new value written to a duty register does not take effect
until the counter resets and the new value is latched. Users may begin the new duty cycle immediately
by writing the new value to the duty register, then writing any value to the counter. The counter will reset
and the new duty cycle value will be latched. If the value in the duty register is equal to or greater than
the value in the period register, there will be no change in state. Refer to 9.1 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:
The following conditions always cause the corresponding output to be low:
PWDTYx = $00, PWPERx > $00, and PPOLx = 0
PWDTYx PWPERx, and PPOLx = 1
PWPERx = $00 and PPOLx = 1
PWDTYx = $00, PWPERx > $00, and PPOLx = 1
PWDTYx PWPERx, and PPOLx = 0
PWPERx = $00 and PPOLx = 0
Bit 7
Bit 7
1
6
6
1
Freescale Semiconductor, Inc.
For More Information On This Product,
5
5
1
Go to: www.freescale.com
4
4
1
3
3
1
2
2
1
1
1
1
Bit 0
Bit 0
1
MC68HC11C0TS/D
PWDTY1
PWDTY2
MC68HC11C0