Datasheet

V850ES/JG3 CHAPTER 25 CRC FUNCTION
R01UH0015EJ0300 Rev.3.00 Page 714 of 870
Sep 30, 2010
CHAPTER 25 CRC FUNCTION
25.1 Functions
• CRC operation circuit for detection of data block errors
• Generation of 16-bit CRC code using a CRC-CCITT (X
16
+ X
12
+ X
5
+ 1) generation polynomial for blocks of data of
any length in 8-bit units
• CRC code is set to the CRC data register each time 1-byte data is transferred to the CRCIN register, after the initial
value is set to the CRCD register.
25.2 Configuration
The CRC function includes the following hardware.
Table 25-1. CRC Configuration
Item Configuration
Control registers
CRC input register (CRCIN)
CRC data register (CRCD)
Figure 25-1. Block Diagram of CRC Register
CRC data register (CRCD) (16 bits)
CRC input register (CRCIN) (8 bits)
Internal bus
Internal bus
CRC code generator