参数资料
型号: M30240M5-XXXFP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
封装: 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 12/139页
文件大小: 1453K
代理商: M30240M5-XXXFP
109
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Specifications REV. G
Specifications in this manual are tentative and subject to change
CRC Calculation Circuit
1.2.25 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 1.104 shows the block diagram of the CRC circuit. Figure 1.105 shows the CRC-related registers.
Figure 1.104:
Block diagram of CRC circuit
Figure 1.105: 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 03BD 16, 03BC
(Address 03BE
16
)
16
)
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
相关PDF资料
PDF描述
M30240M6-XXXXFP 16-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
M30240ECFP 16-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQFP80
M30240M5-XXXXFP 16-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
M30240M6-XXXXFP 16-BIT, OTPROM, MICROCONTROLLER, PQFP80
M30240ECFP 16-BIT, OTPROM, MICROCONTROLLER, PQFP80
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