參數(shù)資料
型號: M30240M1-XXXFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, MICROCONTROLLER, PQFP80
封裝: 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 15/125頁
文件大?。?/td> 753K
代理商: M30240M1-XXXFP
Mitsubishi microcomputers
M16C / 24 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
113
CONFIDENTIAL
Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change
CRC Calculation Circuit
2.25 CRC Calculation Circuit
The Cyclic Redundancy Check (CRC) calculation circuit detects an error in data blocks. The
microcomputer uses a generator polynomial of CRC_CCITT (X16 + X12 + X5 + 1) to generate CRC
code.
The CRC code is a 16-bit code generated for a block of a given data length in multiples of 8 bits. The
CRC code is set in a CRC data register each time one byte of data is transferred to a CRC input register
after writing an initial value into the CRC data register. Generation of CRC code for one byte of data is
completed in two machine cycles.
Figure 106 shows the block diagram of the CRC circuit. Figure 107 shows the CRC-related registers.
Figure 106:
Block diagram of CRC circuit
Figure 107:
CRC-related registers
Eight low-order bits
Eight high-order bits
Data bus high-order bits
Data bus low-order bits
CRC data register (16)
CRC input register (8)
CRC code generating circuit
x16 + x12 + x5 + 1
(Addresses 03BD16, 03BC16)
(Address 03BE16)
Symbol
Address
When reset
CRCD
03BD16, 03BC16
Indeterminate
b7
b0 b7
b0
(b15)
(b8)
CRC data register
W
R
CRC calculation result output register
Function
Values that
can be set
000016 to FFFF16
Symbo
Address
When reset
CRCIN
03BE16
Indeterminate
b7
b0
CRC input register
W
R
Data input register
Function
Values that
can be set
0016 to FF16
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