PXS20RM Datasheet, PDF (648/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Flexible Motor Control Pulse Width Modulator Module (FlexPWM)
• Enhanced dual edge capture functionality
• The option to supply the source for each complementary PWM signal pair from any of the
following:
— external digital pin
— internal timer channel
— external ADC input, taking into account values set in ADC high and low limit registers.
25.1.3 Modes of operation
Care must be exercised when using this module in certain chip operating modes. Some motors (such
3-phase AC motors) require regular software updates for proper operation. Failure to do so could result
in destroying the motor or inverter. Because of this, PWM outputs are placed in their inactive states in
STOP mode, and optionally under WAIT and debug modes. PWM outputs will be reactivated (assuming
they were active to begin with) when these modes are exited.
Table 25-1. Modes when PWM operation is restricted
Mode
STOP
WAIT
DEBUG
Description
Peripheral and CPU clocks are stopped. PWM outputs are driven inactive.
CPU clocks are stopped while peripheral clocks continue to run. PWM
outputs are driven inactive as a function of the WAITEN bit.
CPU and peripheral clocks continue to run, but CPU maybe stalled for
periods of time. PWM outputs are driven inactive as a function of the DBGEN
bit.
25-2
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor