NXP Semiconductors MPC5644A, Reference Manual, Page: 1241 / 1735

Cyclic Redundancy Checker (CRC) Unit
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1241
The writes can be by the processor core or by DMA transfer. The writes continue until the end of the data
stream is reached.
29.3.4 Reading the checksum
After writing of the data stream to the input register has been completed, the checksum is read from the
output register (CRC_OUTP). The CRC_OUTP register includes the final checksum (signature)
corresponding to the CRC_CSTAT register value with swap and inversion operations applied, if selected
via the CRC_CFG register.
In case of CRC-16-CCITT polynomial only the 16 least significant bits have meaning. The 16 most
significant bits are set to 0 during the computation.
29.4 Register descriptions
Table 29-1. CRC register map
Context Address
1
1
CRC_BASE for the MPC5644A is 0xFFE6_8000
Register Location
1
CR 0x0000 CRC Configuration Register (CRC_CFG) on page
29-1242
CR 0x0004 CRC Input Register (CRC_INP) on page
29-1243
CR 0x0008 CRC Current Status Register (CRC_CSTAT) on page
29-1244
CR 0x000C CRC Output Register (CRC_OUTP) on page
29-1245
2
CR 0x0010 CRC Configuration Register (CRC_CFG) on page
29-1242
CR 0x0014 CRC Input Register (CRC_INP) on page
29-1243
CR 0x0018 CRC Current Status Register (CRC_CSTAT) on page
29-1244
CR 0x001C CRC Output Register (CRC_OUTP) on page
29-1245
3
CR 0x0020 CRC Configuration Register (CRC_CFG) on page
29-1242
CR 0x0024 CRC Input Register (CRC_INP) on page
29-1243
CR 0x0028 CRC Current Status Register (CRC_CSTAT) on page
29-1244
CR 0x002C CRC Output Register (CRC_OUTP) on page
29-1245