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Stand-by state – Motorola M68HC08 User Manual

Page 93

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Software Design

State Diagram

DRM028 — Rev 0

Designer Reference Manual

MOTOROLA

Software Design

93

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.

CURRENT IS HIGHER THAN LIMIT

ENTER

EXIT

START CONDITION TEST

FAULT STATE

SPEED INPUT

AND

DC-BUS VOLTAGE

MEASUREMENTS

ERROR IN HARDWARE

OVER VOLTAGE

OR

UNDER VOLTAGE

DONE

DONE

CURRENT MEASUREMENT

AND

CURRENT CALIBRATION

WHEN PWM IS OFF

START CONDITION

(START SWITCH CHANGED

FROM STOP TO START OR

START AND PC MODE AND START CTRL)

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Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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