C8051F989-GUR Silicon Labs, C8051F989-GUR Datasheet - Page 171
C8051F989-GUR
Manufacturer Part Number
C8051F989-GUR
Description
8-bit Microcontrollers - MCU 4kB 512B RAM
Manufacturer
Silicon Labs
Datasheet
1.C8051F986-GUR.pdf
(322 pages)
Specifications of C8051F989-GUR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
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The 16-bit C8051F99x-C8051F98x CRC algorithm can be described by the following code:
unsigned short UpdateCRC (unsigned short CRC_acc, unsigned char CRC_input)
{
}
Table 16.1 lists several input values and the associated outputs using the 16-bit C8051F99x-C8051F98x
CRC algorithm:
unsigned char i;
#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++)
{
}
// Return the final remainder (CRC value)
return CRC_acc;
// Check if the MSB is set (if MSB is 1, then the POLY can "divide"
// into the "dividend")
if ((CRC_acc & 0x8000) == 0x8000)
{
}
else
{
}
// if so, shift the CRC value, and XOR "subtract" the poly
CRC_acc = CRC_acc << 1;
CRC_acc ^= POLY;
// if not, just shift the CRC value
CRC_acc = CRC_acc << 1;
0x00, 0x00, 0xAA, 0xBB, 0xCC
0xAA, 0xBB, 0xCC
Table 16.1. Example 16-bit CRC Outputs
Input
0x8C
0x7D
0x63
// loop counter
Rev. 1.1
C8051F99x-C8051F98x
0x4ECA
0xBD35
0x6CF6
0xB1F4
0xB166
Output
171
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