MCP39F521 datasheet(30/52 Pages) MICROCHIP

30 / 52 page

MCP39F521

DS20005442A-page 30

 2015 Microchip Technology Inc.

6.2

Address Pointer Register

This unsigned 16-bit register contains the address to

which all read and write instructions occur. This register

is only written through the Set Address Pointer

command and is otherwise outside the writable range

of register addresses.

6.3

System Status Register

The System Status register is a read-only register and

can be used to detect the various states of pin levels as

defined below.

SYSTEM STATUS REGISTER

U-0

R-x

U-0

—

EVENT

—

bit 15

bit 8

U-0

R-x

—

—SIGN_PR

SIGN_PA

OVERPOW

OVERCUR

VSURGE

VSAG

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-12

Unimplemented

: Read as ‘0’

bit 11

Unimplemented

: Read as ‘0’

bit 10

EVENT:

State of Event Detection algorithm. This bit is latched and must be cleared.

= Event has occurred

= Event has not occurred

bit 9-8

Unimplemented

: Read as ‘0’

bit 7-6

Unimplemented

: Read as ‘0’

bit 5

SIGN_PR:

Sign of Reactive Power

= Reactive Power is positive, inductive and is in quadrants 1,2

= Reactive Power is negative, is capacitive and is in quadrants 3,4

bit 4

SIGN_PA:

Sign of Active Power (import/export sign of active power)

= Active Power is positive (import) and is in quadrants 1,4

= Active Power is negative (export) and is in quadrants 2,3

bit 3

OVERPOW:

State of Over Power detection algorithm

= Over Power threshold has been broken

= Over Power threshold has not been broken

bit 2

OVERCUR:

State of the Over Current detection algorithm

= Over Current threshold has been broken

= Over Current threshold has not been broken

bit 1

VSURGE:

State of Voltage Surge Detection algorithm. This bit is latched and must be cleared.

= Surge threshold has been broken

= Surge threshold has not been broken

bit 0

VSAG:

State of Voltage Sag Detection algorithm. This bit is latched and must be cleared.

= Sag threshold has been broken

= Sag threshold has not been broken

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