SDAA287 March 2026 ADS112C04 , ADS112U04 , ADS114S06 , ADS114S08 , ADS122C04 , ADS122U04 , ADS124S06 , ADS124S08 , ADS125H01 , ADS125H02 , ADS1260 , ADS1261 , ADS1262 , ADS1263 , ADS127L01 , ADS127L11 , ADS127L14 , ADS127L18 , ADS127L21 , ADS131A02 , ADS131A04 , ADS131M02 , ADS131M02-Q1 , ADS131M03 , ADS131M03-Q1 , ADS131M04 , ADS131M04-Q1 , ADS131M06 , ADS131M06-Q1 , ADS131M08 , ADS131M08-Q1 , ADS7028 , ADS7038 , ADS7066 , ADS7067 , ADS7128 , ADS7138 , AFE78101 , AFE781H1 , AFE78201 , AFE782H1 , AFE88101 , AFE881H1 , AFE88201 , AFE882H1 , DAC60504 , DAC60508 , DAC61401 , DAC61402 , DAC61404 , DAC61408 , DAC61416 , DAC70504 , DAC70508 , DAC71408 , DAC71416 , DAC7750 , DAC7760 , DAC80504 , DAC80508 , DAC81401 , DAC81402 , DAC81404 , DAC81408 , DAC81416 , DAC8741H , DAC8742H , DAC8750 , DAC8760 , DAC8771 , DAC8775 , HDC3020 , HDC3020-Q1 , HDC3021 , HDC3021-Q1 , HDC3022 , HDC3022-Q1 , LMP90077 , LMP90078 , LMP90079 , LMP90080 , LMP90097 , LMP90098 , LMP90099 , LMP90100 , TMAG5173-Q1 , TMP114 , TMP126 , TMP126-Q1 , TMP1826 , TMP1827
2.2 CRC-8-CCITT, 0xFF Initial Value
The example CRC code can be changed to calculate other CRC types. For other 8-bit CRC calculations, check the initial value and the CRC polynomial.
In different CRC versions, the initial
value is set as either 0x00 or 0xFF. To alter the code to check for the same
polynomial, but using 0xFF as the initial value, change the value of let crc
in the second line of the function. The function is renamed to
crc8CCITTOnes() to show a different initial value. Figure 2-6 shows the
code with a new initial value of 0xFF.
Figure 2-6 CRC-8-CCITT, Initial Value 0xFF, Calculation FunctionIn the body section of the html, make
sure that the description is changed to reflect the new initial value of 0xFF. This
new CRC-8-CCITTOnes() function with 0xFF initial value is also
updated at the end of the calculateCRC() function.
Table 2-5 lists the new CRC-8-CCITTOnes() with a list of TI devices that
use this CRC algorithm. The last column provides the calculation for ABC123 to check
your code.
| CRC | Polynomial | Initial Value | Devices | CRC for 0xABC123 |
|---|---|---|---|---|
| CRC-8-CCITT | x8 + x2 + x + 1 (0x07) | 0xFF | ADS1261, ADS127L11, ADS127L14, ADS127L18, ADS127L21, ADS7066, ADS7067, TMAG5173-Q1, TMP114 | 0x9E |
After making changes to the JavaScript, run the CRC-8-CCITT 0xFF initial value code. Figure 2-7 shows the new result for the CRC.
Figure 2-7 CRC Result for 0xABC123, CRC-8-CCITT, Initial Value 0xFF