參數(shù)資料
型號(hào): M30240S9-XXXFP
廠商: Mitsubishi Electric Corporation
英文描述: 16 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor
中文描述: 單片16位CMOS微機(jī)
文件頁(yè)數(shù): 116/142頁(yè)
文件大?。?/td> 1637K
代理商: M30240S9-XXXFP
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1-116
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
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 1.105 shows the block diagram of the CRC circuit. Figure 1.106 shows the CRC-related registers.
Figure 1.105: Block diagram of CRC circuit
Figure 1.106: CRC-related registers
AAAAAA
AAAAAAAAAA
Eight low-order bits
AAAAAA
Eight high-order bits
Data bus high-order bits
Data bus low-order bits
AAAAAAAAAA
AAAAAAAAAA
AAAAAA
AAAAAA
CRC data register (16)
AAAAAAAAAA
CRC code generating circuit
(Addresses 03BD
16
, 03BC
16
)
16
)
Symbol
CRCD
Address
When reset
Indeterminate
03BD
16
, 03BC
16
b7
b0 b7
b0
(b15)
(b8)
CRC data register
W
R
CRC calculation result output register
Function
Values that
can be set
0000
16
to FFFF
16
Symbo
CRCIN
Address
03BE
16
When reset
Indeterminate
b7
b0
CRC input register
Data input register
Function
Values that
can be set
00
16
to FF
16
AA
AA
AA
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