MC9S12T64 Datasheet, PDF (329/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Pulse Width Modulator (PWM8B8C)
Modes of Operation
WARNING:
While in special modes, do not access registers $0006, $0007,
$000A and $000B. Writing to any of these registers can alter the
PWM functionality.
Freeze Mode
The PWM module enters freeze mode when background debug mode
(BDM) is active.
Emulation Modes
In Freeze Mode, there is an option to disable the input clock to the
prescaler by setting the PFRZ bit in the PWMCTL register. If this bit is
set, whenever the MCU is in freeze mode the input clock to the prescaler
is disabled. This feature is useful during emulation as it allows the PWM
function to be suspended. In this way, the counters of the PWM can be
stopped while in freeze mode so that once normal program flow is
continued, the counters are re-enabled to simulate real-time operations.
Since the registers can still be accessed in this mode, to re-enable the
prescaler clock, either disable the PFRZ bit or exit freeze mode.
Pulse Width Modulator (PWM8B8C)
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MC9S12T64Revision 1.1.1