Datasheet

Rev. 3.00, 03/04, page 428 of 830
14.11 CRC Operation Circuit
The cyclic redundancy check (CRC) operation circuit detects errors in data blocks.
14.11.1 Features
The features of the CRC operation circuit are listed below.
• CRC code generated for any desired data length in an 8-bit unit
• CRC operation executed on eight bits in parallel
• One of three generating polynomials selectable
• CRC code generation for LSB-first or MSB-first communication selectable
Figure 14.45 shows a block diagram of the CRC operation circuit.
Internal bus
CRC code
generation
circuit
CRCCR
CRCDIR
CRCDOR
Control
signal
[Legend]
CRCCR:
CRCDIR:
CRCDOR:
CRC control register
CRC data input register
CRC data output register
Figure 14.45 Block Diagram of CRC Operation Circuit
14.11.2 Register Descriptions
The CRC operation circuit has the following registers.
• CRC control register (CRCCR)
• CRC data input register (CRCDIR)
• CRC data output register (CRCDOR)