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Operation

MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2

Freescale Semiconductor

Address: $FE01

POWER

RESET

MC3PHAC

FUNCTIONAL

FAULT

MC3PHAC

FUNCTIONAL

FAULT

PC MASTER

SOFTWARE

RESET

COMMAND

LOW VDD

VOLTAGE

Reset

0000

= Unimplemented or Reserved

Figure 17. Reset Status Register

Table 10. Reset Status Register Field Descriptions

Field

Description

POWER UP

POWER UP Bit — This read-only bit indicates the last system reset was caused by the power-up

reset detection circuit.

0 Power-up reset was not the source of the reset or a read of the reset status register after the

first read.

1 The last reset was caused by an initial power-up of the MC3PHAC.

RESET PIN

RESET PIN Bit — This read-only bit indicates the last system reset was caused from the RESET

input pin.

0 The RESET pin was not the source of the reset or a read of the reset status register after the

first read.

1 Last reset was caused by an external reset applied to the RESET input pin.

5–4

MC3PHAC

FUNCTIONAL

FAULT BITS

MC3PHAC FUNCTIONAL FAULT Bits — This read-only bit indicates if the last system reset was

the result of an internal system error.

0 The FUNCTIONAL FAULT was not the source of the reset or a read of the reset status register

after the first read.

1 MC3PHAC internal system error

PC MASTER

SOFTWARE

RESET

COMMAND

PC MASTER SOFTWARE RESET COMMAND Bit — This read-only bit indicates the last system

reset was the result of a PC master software reset command.

0 The PC master software RESET COMMAND was not the source of the reset or a read of the

reset status register after the first read.

1 The MC3PHAC was reset by the PC master software command reset as the result of a write

of $30 to location $1000

LOW VDD

VOLTAGE

LOW VDD VOLTAGE Bit — This read-only bit indicates if the last reset was the result of low VDD

applied to the MC3PHAC.

0The LOW VDD was not the source of the reset or a read of the reset status register after the

first read.

1 The last reset was caused by the low power supply detection circuit.

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