HD64F2168 Datasheet, PDF (468/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

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.
CRCCR
CRCDIR
CRCDOR
Control
signal
CRC code
generation
circuit
[Legend]
CRCCR: CRC control register
CRCDIR: CRC data input register
CRCDOR: 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)
Rev. 3.00, 03/04, page 428 of 830