C8051F410-TB Silicon Laboratories Inc, C8051F410-TB Datasheet - Page 121

• Manufacturer Part Number: C8051F410-TB
• Description: BOARD PROTOTYPING W/C8051F410
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F410-TB

• Contents: Board
• Processor To Be Evaluated: C8051F41x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F410
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14. Cyclic Redundancy Check Unit (CRC0)
C8051F41x devices include a cyclic redundancy check unit (CRC0) that can perform a CRC using a 16-bit
or 32-bit polynomial. CRC0 accepts a stream of 8-bit data written to the CRC0IN register. CRC0 posts the
16-bit or 32-bit result to an internal register. The internal result register may be accessed indirectly using
the CRC0PNT bits and CRC0DAT register, as shown in Figure 14.1. CRC0 also has a bit reverse register
for quick data manipulation.
14.1. 16-bit CRC Algorithm
The C8051F41x CRC unit calculates the 16-bit CRC MSB-first, using a poly of 0x1021. The following
describes the 16-bit CRC algorithm performed by the hardware:
Step 1. XOR the most-significant byte of the current CRC result with the input byte. If this is the
Step 2a. If the MSB of the CRC result is set, left-shift the CRC result, and then XOR the CRC
Step 2b. If the MSB of the CRC result is not set, left-shift the CRC result.
Step 3. Repeat at Step 2a for the number of input bits (8).
first iteration of the CRC unit, the current CRC result will be the set initial value (0x0000 or
0xFFFF).
result with the polynomial (0x1021).
CRC0PNT1
CRC0PNT0
CRC0SEL
CRC0INIT
CRC0VAL
Figure 14.1. CRC0 Block Diagram
CRC0IN
8
Rev. 1.1
CRC Engine
8
RESULT
4 to 1 MUX
8
32
8
8
8
C8051F410/1/2/3
CRC0DAT
121