MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2

24

Freescale Semiconductor

Operation

Each bit variable listed in Table 6 is defined in Figure 14, Figure 15, Figure 16, and Figure 17.

Address: $00C8

76

54

321

0

R

SPEED

CHANGING

FORWARD

MOTION

MOTOR

ENERGIZED

RESISTIVE

BRAKE

EXTERNAL

FAULT TRIP

OVER

VOLTAGE

TRIP

UNDER

VOLTAGE

TRIP

W

Reset

U

01

00

U

0

0

= Unimplemented or Reserved

U = Unaffected

Figure 14. Status Register

Table 7. Status Register Field Descriptions

Field

Description

6

SPEED

CHANGING

SPEED CHANGING Bit — This read-only bit indicates if the motor is at a steady speed or if it is

accelerating or declerating.

0 Motor is at a steady speed.

1 Motor is accelerating or decelerating.

5

FORWARD

MOTION

FORWARD MOTION Bit — This read-only bit indicates the direction of the motor. It also indicates

if the motor is stopped.

0 Motor is rotating in the reverse direction.

1 Motor is rotating in the forward direction. If this bit is a logic 1 and the actual frequency (location

$0085 and $0086) is 0, the motor is stopped.

4

MOTOR

ENERGIZED

MOTOR ENERGIZED Bit — This read-only bit indicates PWM output activity

0 The PWM outputs are inactive or the bottom PWM outputs are in the pre-charge cycle.

1 All PWM outputs are active.

3

RESISTIVE

BRAKE

RESISTIVE BREAK Bit — This read-only bit indicates the state of the RBRAKE output pin

0 The RBRAKE output pin is inactive and no braking is in progress.

1 The RBRAKE output pin is active. Braking is in progress.

2

EXTERNAL

FAULT TRIP

EXTERNAL FAULT TRIP Bit — This read-only bit indicates a FAULT has occurred resulting from

a logic 1 applied to the FAULTIN pin.

0 A logic 0 is applied to the FAULTIN pin and no FAULT timeout is in progress.

1 A logic 1 was applied to the FAULTIN pin and a FAULT timeout is still in progress.

1

OVER

VOLTAGE

TRIP

OVER-VOLTAGE TRIP Bit — This read-only bit indicates if the voltage at the DC_BUS pin

a FAULT timeout is not in progress.

and a FAULT timeout is still in progress.

0

UNDER

VOLTAGE

TRIP

UNDER-VOLTAGE Bit — This read-only bit indicates if the voltage at the DC_BUS pin is less

and a FAULT timeout is not in progress.

and a FAULT timeout is still in progress.