mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 195

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Chapter 10
Cyclic Redundancy Check Generator (CRCV2)
10.1
This section describes the Cyclic Redundancy Check (CRC) generator module which uses the 16-bit
CRC-CCITT polynomial, x
is calculated for 8-bits of data at a time, and provides a simple check for all accessible memory locations,
whether they be in FLASH or RAM.
10.1.1
Features of the CRC module include:
10.1.2
This section defines the CRC operation in run, wait, and stop modes.
Freescale Semiconductor
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Hardware CRC generator circuit using 16-bit shift register
CRC16-CCITT compliancy with x
Error detection for all single, double, odd, and most multi-bit errors
Programmable initial seed value
High-speed CRC calculation
Run Mode - This is the basic mode of operation.
Wait Mode - The CRC module is operational.
Stop 1 and 2 Modes- The CRC module is not functional in these modes and will be put into its reset
state upon recovery from stop.
Stop 3 Mode - In this mode, the CRC module will go into a low power standby state. Any CRC
calculations in progress will stop and resume after the CPU goes into run mode.
Introduction
Features
Modes of Operation
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
16
+ x
12
+ x
5
+ 1, to generate a CRC code for error detection. The 16-bit code
16
+ x
12
+ x
5
+ 1 polynomial
10-1