Chapter 19 Pulse-Width Modulator (S12PWM8B8CV1)
MC9S12XE-Family Reference Manual , Rev. 1.19
692
Freescale Semiconductor
19.1.2
Modes of Operation
There is a software programmable option for low power consumption in wait mode that disables the input
clock to the prescaler.
In freeze mode there is a software programmable option to disable the input clock to the prescaler. This is
useful for emulation.
19.1.3
Block Diagram
shows the block diagram for the 8-bit 8-channel PWM block.
Figure 19-1. PWM Block Diagram
19.2
External Signal Description
The PWM module has a total of 8 external pins.
Period and Duty
Counter
Channel 6
Clock Select
PWM Clock
Period and Duty
Counter
Channel 5
Period and Duty
Counter
Channel 4
Period and Duty
Counter
Channel 3
Period and Duty
Counter
Channel 2
Period and Duty
Counter
Channel 1
Alignment
Polarity
Control
PWM8B8C
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
Enable
PWM Channels
Period and Duty
Counter
Channel 7
Period and Duty
Counter
Channel 0
PWM0
PWM7
Bus Clock
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages