MC68HC12 Datasheet, PDF (231/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

Pulse Width Modulator
PWM Register Descriptions
PPOL3 — PWM Channel 3 Polarity
0 = Channel 3 output is low at the beginning of the period; high
when the duty count is reached.
1 = Channel 3 output is high at the beginning of the period; low
when the duty count is reached.
PPOL2 — PWM Channel 2 Polarity
0 = Channel 2 output is low at the beginning of the period; high
when the duty count is reached.
1 = Channel 2 output is high at the beginning of the period; low
when the duty count is reached.
PPOL1 — PWM Channel 1 Polarity
0 = Channel 1 output is low at the beginning of the period; high
when the duty count is reached.
1 = Channel 1 output is high at the beginning of the period; low
when the duty count is reached.
PPOL0 — PWM Channel 0 Polarity
0 = Channel 0 output is low at the beginning of the period; high
when the duty count is reached.
1 = Channel 0 output is high at the beginning of the period; low
when the duty count is reached.
Depending on the polarity bit, the duty registers may contain the count
of either the high time or the low time. If the polarity bit is zero and left
alignment is selected, the duty registers contain a count of the low
time. If the polarity bit is one, the duty registers contain a count of the
high time.
MC68HC912DT128A — Rev 4.0
MOTOROLA
Pulse Width Modulator
Technical Data
231