Motorola M68HC08 manual Initialize MCU, Initialize Application, Stand-By

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Software Design

State Diagram

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.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Software Design	91
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