C8051F93X-C8051F92X 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

The 16-bit C8051F93x-C8051F92x CRC algorithm can be described by the following code:

unsigned short UpdateCRC (unsigned short CRC_acc, unsigned char CRC_input)

{

unsigned char i;

// loop counter

#define POLY 0x1021

// Create the CRC "dividend" for polynomial arithmetic (binary arithmetic

// with no carries)

CRC_acc = CRC_acc ^ (CRC_input << 8);

// "Divide" the poly into the dividend using CRC XOR subtraction

// CRC_acc holds the "remainder" of each divide

//

// Only complete this division for 8 bits since input is 1 byte

for (i = 0; i < 8; i++)

{

// Check if the MSB is set (if MSB is 1, then the POLY can "divide"

// into the "dividend")

if ((CRC_acc & 0x8000) == 0x8000)

{

// if so, shift the CRC value, and XOR "subtract" the poly

CRC_acc = CRC_acc << 1;

CRC_acc ^= POLY;

}

else

{

// if not, just shift the CRC value

CRC_acc = CRC_acc << 1;

}

}

// Return the final remainder (CRC value)

return CRC_acc;

}

The following table lists several input values and the associated outputs using the 16-bit C8051F93x-

C8051F92x CRC algorithm:

Table 15.1. Example 16-bit CRC Outputs

Input

0x63

0x8C

0x7D

0xAA, 0xBB, 0xCC

0x00, 0x00, 0xAA, 0xBB, 0xCC

Output

0xBD35

0xB1F4

0x4ECA

0x6CF6

0xB166

168

Rev. 1.3

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