MCP3910 datasheet(74/86 Pages) MICROCHIP

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MCP3910

DS20005116B-page 74

 2012-2014 Microchip Technology Inc.

9.9

SECURITY Register - Password

and CRC-16 on Register Map

Name

Bits

Address

Cof

LOCK/CRC

0x1F

R/W

LOCK/CRC REGISTER

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

LOCK<7>

LOCK<6>

LOCK<5>

LOCK<4>

LOCK<3>

LOCK<2>

LOCK<1>

LOCK<0>

bit 23

bit 16

R/W-0

CRCREG<15>

CRCREG<14>

CRCREG<13>

CRCREG<12>

CRCREG<11>

CRCREG<10>

CRCREG<9>

CRCREG<8>

bit 15

bit 8

R/W-0

CRCREG<7>

CRCREG<6>

CRCREG<5>

CRCREG<4>

CRCREG<3>

CRCREG<2>

CRCREG<1>

CRCREG<0>

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 23-16

LOCKn<7:0>:

Lock Code for the writable part of the register map

LOCK<7:0> = PASSWORD = 0xA5 (Default value): The entire register map is writable. The

CRCREG<15:0> bits and the CRC Interrupt are cleared. No CRC-16 checksum on register map is

calculated.

LOCK<7:0> different than 0xA5: The only writable register is the LOCK/CRC register. All other registers

will appear as undefined while in this mode. The CRCREG checksum is calculated continuously

and can generate interrupts if the CRC Interrupt EN_INT bit has been enabled. If a write to a reg-

ister needs to be performed, the user needs to unlock the register map beforehand by writing 0xA5

to the LOCK<7:0> bits.

bit 15-0

CRCREGn<15:0>:

CRC-16 Checksum that is calculated with the writable part of the register map as a

message. This is a read-only 16-bit code. This checksum is continuously recalculated and updated

every 12 DMCLK periods. It is reset to its default value (0x0000) when LOCK<7:0> = 0xA5.

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