Motorola M68HC08 manual Stand-by State

Freescale Semiconductor, Inc.

Software Design

State Diagram

Freescale Semiconductor, Inc.

ENTER

CURRENT MEASUREMENT

AND

CURRENT CALIBRATION

WHEN PWM IS OFF

DONE

START CONDITION TEST

START CONDITION (START SWITCH CHANGED FROM STOP TO START OR

START AND PC MODE AND START CTRL)

SPEED INPUT

AND

DC-BUS VOLTAGE

MEASUREMENTS

DONE

EXIT

CURRENT IS HIGHER THAN LIMIT

ERROR IN HARDWARE

FAULT STATE

OVER VOLTAGE

OR

UNDER VOLTAGE

Figure 5-8. Stand-by State

Speed input and dc-bus voltage measurements

The dc-bus voltage is measured after the start switch is turned ON. This prevents the measurement being disturbed by the power turn ON. Where that dc-bus voltage is not within the limits, the control flow enters into the fault state.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Software Design	93
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