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M32C/86 Datasheet(PDF) 280 Page - Renesas Technology Corp

Part # M32C/86
Description  RENESAS 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES
PDF  505 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M32C/86 Datasheet(HTML) 280 Page - Renesas Technology Corp

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Page 257
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20. CRC Calculation
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8 low-order bits
8 high-
order bits
High-order bits of data bus
Low-order bits of data bus
CRCD register
CRCIN register
CRC code generation circuit
x16 + x12 + x5 + 1
Setting Range
CRC Data Register
Function
Symbol
Address
After Reset
CRCD
037D16- 037C16
Indeterminate
RW
000016 to FFFF16
RW
After default value is written to the CRCD
register, the CRC code can be read from the
CRCD register by writing data to the CRCIN
register. Bit position of the default value is
inversed. The inversed value is read as the CRC
code.
b15
b8
b7
b0
Setting Range
CRC Input Register
Function
Symbol
Address
After Reset
CRCIN
037E16
Indeterminate
RW
Data input.
Inverse bit position of data.
0016 to FF16
RW
b7
b0
20. CRC Calculation
The CRC (Cyclic Redundancy Check) calculation detects an error in data blocks. A generator polynomial
of CRC_CCITT (X16 + X12 + X5 + 1) generates CRC code.
The CRC code is a 16-bit code generated for a block of data of desired length. This block of data is in 8-bit
units.The CRC code is set in the CRCD register every time one-byte data is transferred to the CRCIN
register after a default value is written to the CRCD register. CRC code generation for one-byte data is
completed in two cycles.
Figure 20.1 shows a block diagram of a CRC circuit. Figure 20.2 shows CRC-associated registers. Figure
20.3 shows an example of the CRC calculation.
Figure 20.1 CRC Calculation Block Diagram
Figure 20.2 CRCD Register and CRCIN Register



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