C8051F700-GQR Silicon Laboratories Inc, C8051F700-GQR Datasheet - Page 214
C8051F700-GQR
Manufacturer Part Number
C8051F700-GQR
Description
MCU 8-Bit C8051F70x 8051 CISC 15KB Flash 1.8V/3V 64-Pin TQFP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F700DK.pdf
(306 pages)
Specifications of C8051F700-GQR
Package
64TQFP
Device Core
8051
Family Name
C8051F70x
Maximum Speed
25 MHz
Ram Size
512 Byte
Program Memory Size
15 KB
Operating Supply Voltage
1.8|3 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
54
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
16-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
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C8051F70x/71x
29.3. Preparing for a CRC Calculation
To prepare CRC0 for a CRC calculation, software should select the desired polynomial and set the initial
value of the result. Two polynomials are available: 0x1021 (16-bit) and 0x04C11DB7 (32-bit). The CRC0
result may be initialized to one of two values: 0x00000000 or 0xFFFFFFFF. The following steps can be
used to initialize CRC0.
1. Select a polynomial (Set CRC0SEL to 0 for 32-bit or 1 for 16-bit).
2. Select the initial result value (Set CRC0VAL to 0 for 0x00000000 or 1 for 0xFFFFFFFF).
3. Set the result to its initial value (Write 1 to CRC0INIT).
29.4. Performing a CRC Calculation
Once CRC0 is initialized, the input data stream is sequentially written to CRC0IN, one byte at a time. The
CRC0 result is automatically updated after each byte is written. The CRC engine may also be configured to
automatically perform a CRC on one or more Flash sectors. The following steps can be used to automati-
cally perform a CRC on Flash memory.
1. Prepare CRC0 for a CRC calculation as shown above.
2. Write the index of the starting page to CRC0AUTO.
3. Set the AUTOEN bit in CRC0AUTO.
4. Write the number of Flash sectors to perform in the CRC calculation to CRC0CNT.
Note: Each Flash sector is 512 bytes.
5. Write any value to CRC0CN (or OR its contents with 0x00) to initiate the CRC calculation. The CPU will
not execute code any additional code until the CRC operation completes.
6. Clear the AUTOEN bit in CRC0AUTO.
7. Read the CRC result using the procedure below.
29.5. Accessing the CRC0 Result
The internal CRC0 result is 32-bits (CRC0SEL = 0b) or 16-bits (CRC0SEL = 1b). The CRC0PNT bits
select the byte that is targeted by read and write operations on CRC0DAT and increment after each read or
write. The calculation result will remain in the internal CR0 result register until it is set, overwritten, or addi-
tional data is written to CRC0IN.
214
Rev. 1.0
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