ATECC508A datasheet(14/109 Pages) MICROCHIP

14 / 109 page

Byte

Name

Description

Write

Read

Bits 1-0: GPIO_Mode (see Section General Purpose I/O Pin).

00 = Disabled. SCL pin is unused should be tied low

on the board.

01 = Authorization modes, bit 3 determines device

operation.

10 = Input. Current value on the SCL pin returned by

Info command.

11 = Output. SCL may be driven high or low by Info

command.

Reserved

Reserved. Must be zero.

If Config

unlocked

Always

OTPmode

0xAA (Read-only

Mode) =

Writes to the OTP zone are forbidden

when the OTP zone is locked. Reads of

all words are permitted.

0x55 (Consumption

Mode) =

Writes to the OTP zone when the OTP

zone is locked; causes bits to transition

only from a one to a zero. Reads of all

words are permitted.

All other values of OTP mode are reserved and should not be used.

If Config

unlocked

Always

ChipMode

Bits 7-3: Must be set to zero.

Bit 2:

Watchdog Duration.

0 =

tWATCHDOG is 1.3s, nominal.

1 =

tWATCHDOG is 10.0s, nominal.

Microchip recommends this be set to zero for the best

security

Bit 1:

TTLenable.

0 =

Input levels use a fixed reference.

1 =

Input levels are VCC referenced.

Bit 0:

SelectorMode.

0 = Selector can always be written with the

UpdateExtra command.

1 = Selector can only be written if it currently has a

value of zero.

If Config

unlocked

Always

20–51 SlotConfig

Two bytes of access and usage permissions and controls for each

slot of the Data zone. See Section SlotConfig (Bytes 20 to 51).

If Config

unlocked

Always

ATECC508A

Device Organization

Datasheet Complete

DS20005927A-page 14

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