MMA685X datasheet(20/52 Pages) FREESCALE

Part #	MMA685X

Description	Single-Axis SPI Inertial Sensor

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

Logo

20 / 52 page

Sensors

Freescale Semiconductor, Inc.

MMA685x

3.2

Customer Accessible Data Array CRC Verification

3.2.1

OTP Shadow Register Array CRC Verification

The OTP shadow register array is verified for errors using a 3-bit CRC. The CRC verification uses a generator polynomial of

g(x) = X 3+ X + 1, with a seed value = ‘111’. If a CRC error is detected in the OTP array, the IDE bit is set in the DEVSTAT register.

3.2.2

Writable Register CRC Verification

The writable registers in the data array are verified for errors using a 3-bit CRC. The CRC verification is enabled only when

the ENDINIT bit is set in the DEVCFG register. The CRC verification uses a generator polynomial of g(x) = X3 + X + 1, with a

seed value = ‘111’. If a CRC error is detected in the writable register array, the IDE bit is set in the DEVSTAT register.

MMA685X Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc