參數(shù)資料
型號: M30218MC-XXXXFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 31/161頁
文件大?。?/td> 2043K
代理商: M30218MC-XXXXFP
Under
development
Tentative Specifications REV.A
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
126
CRC Calculation Circuit
CRC Calculation Circuit
The Cyclic Redundancy Check (CRC) calculation circuit detects an error in data blocks. The microcom-
puter 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 com-
pleted in two machine cycles.
Figure UC-1 shows the block diagram of the CRC circuit. Figure UC-2 shows the CRC-related registers.
Figure UC-3 shows the calculation example using the CRC calculation circuit
Figure UC-2. CRC-related registers
Figure UC-1. Block diagram of CRC circuit
CRC code generating circt
x16 + x12 + x5 + 1
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)
(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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