Personal Computer - Word Processor User Manual

Software Design

State Diagram

DRM028 — Rev 0 Designer Reference Manual

MOTOROLA Software Design 91

5.5.1 Initialize MCU

This state is entered after the MCU is reset, and performs the following

actions:

• MCU ports are configured for the application

• Some application (system) variables are initialized

• MCU clock PLL is locked

• Hardware boards used are identified, and parameters initialized

• PC master communication software is initialized with SCI port

• ADC is initialized

and the state is exited.

5.5.2 Initialize Application

This state is used as an application reset, called following a return from

fault or stop states.

In this state the following actions are done:

• Current measurement path calibrated and checked for error

• Some application (system) variables initialized

• Some MCU peripherals are configured (timer, OC function, PWM)

• PWM outputs for motor control are turned OFF

• Timer 1 (Tim A Ch1) is synchronized with the PWM cycle

• Speed input, dc-bus voltage and temperature measurement is

initialized

• Ready LED is turned ON

and the state is exited.

5.5.3 Stand-By

State diagram for this software is shown in Figure 5-8.

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

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