
MOTOROLA
Chapter 23. READI Module
23-97
Application Notes
23.11.2 Low Power Modes
When the MCU is in sleep, deep-sleep or low power-down mode, all internal clocks on the
MCU are shut down, including the MCKO. The MSEO pin will be held negated.
Low power mode entry for the MCU will be held off until the READI module has
transmitted all existing messages (in the queues and transmit buffers). During this time,
input messages from the development tool are ignored.
Upon restoration of clocks in normal mode, program and data traces will be synchronized,
if enabled.
23.12 Application Notes
This section describes application notes for READI.
23.12.1Automotive Calibration
READI has features that can be used for calibration tasks during automotive system
development. The basic needs for automotive development tools are
1. To acquire, while running an engine or vehicle, crank shaft synchronous data
relating to calibration factors as they are being used or modified during high speed
transient events, with acceptable impact to the system under development.
2. To acquire, while running an engine or vehicle, time synchronous data relating to
calibration factors as they are being used or modified during high speed transient
events, with acceptable impact to the system under development.
3. To coherently modify table(s) of calibration constant with the engine control unit is
running an engine or vehicle.
23.12.1.1 Calibration Variable Acquisition
Calibration variable acquisition refers to the first two points listed in the basic needs for
automotive development tools. READI supports calibration variable acquisition via data
trace (read and write) messaging and read/write access.
Table 23-35. Power Management Mechanism Overview
Feature
Power Saving Mechanism
Disabled Mode
If EVTI is negated at negation of RSTI, the READI module will be
disabled. No trace output will be provided, and output auxiliary port will
be three-stated.
Sleep, Deep-Sleep and
Low Power-Down Mode
All outputs will be held static.
READI Reset (RSTI)
Output auxiliary pins will be three-stated.