MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 51

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RM0008
3.3
3.4
3.4.1
15
31
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14
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30
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Bits 31:0 Data register bits
CRC functional description
The CRC calculation unit mainly consists of a single 32-bit data register, which:
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●
Each write operation into the data register creates a combination of the previous CRC value
and the new one (CRC computation is done on the whole 32-bit data word, and not byte per
byte).
The write operation is stalled until the end of the CRC computation, thus allowing back-to-
back write accesses or consecutive write and read accesses.
The CRC calculator can be reset to FFFF FFFFh with the RESET control bit in the CRC_CR
register. This operation does not affect the contents of the CRC_IDR register.
CRC registers
The CRC calculation unit contains two data registers and a control register.
Data register (CRC_DR)
Address offset: 0x00
Reset value: 0xFFFF FFFF
29
13
rw
rw
is used as an input register to enter new data in the CRC calculator (when writing into
the register)
holds the result of the previous CRC calculation (when reading the register)
Used as an input register when writing new data into the CRC calculator.
Holds the previous CRC calculation result when it is read.
12
28
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11
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27
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26
10
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rw
25
rw
rw
9
Doc ID 13902 Rev 9
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24
rw
DR [31:16]
8
DR [15:0]
23
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rw
7
22
rw
rw
6
rw
21
rw
5
20
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rw
4
19
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rw
3
CRC calculation unit
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18
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2
17
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rw
1
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16
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0