C8051F70X_0910 Datasheet, PDF (199/290 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F70x/71x
SFR Definition 27.4. CRC0AUTO: CRC Automatic Control
Bit
7
6
5
4
3
2
1
0
Name ^{AUTOEN CRCCPT Reserved}
CRC0ST[4:0]
Type
R/W
Reset
0
1
0
0
0
0
0
0
SFR Address = 0x96; SFR Page = F
Bit
Name
Function
7
AUTOEN Automatic CRC Calculation Enable.
When AUTOEN is set to 1, any write to CRC0CN will initiate an automatic CRC
starting at Flash sector CRC0ST and continuing for CRC0CNT sectors.
6
CRCCPT Automatic CRC Calculation Complete.
Set to 0 when a CRC calculation is in progress. Code execution is stopped during
a CRC calculation, therefore reads from firmware will always return 1.
5
Reserved Reserved. Must write 0.
4:0 CRC0ST[4:0] Automatic CRC Calculation Starting Flash Sector.
These bits specify the Flash sector to start the automatic CRC calculation. The
starting address of the first Flash sector included in the automatic CRC calculation
is CRC0ST x 512.
SFR Definition 27.5. CRC0CNT: CRC Automatic Flash Sector Count
Bit
7
6
5
4
3
2
1
0
Name
CRC0CNT[5:0]
Type
R
R
R/W
Reset
0
0
0
0
0
0
0
0
SFR Address = 0x97; SFR Page = F
Bit
Name
Function
7:6
Unused Read = 00b; Write = Don’t Care.
5:0 CRC0CNT[5:0] Automatic CRC Calculation Flash Sector Count.
These bits specify the number of Flash sectors to include when performing an
automatic CRC calculation. The base address of the last flash sector included in
the automatic CRC calculation is equal to (CRC0ST + CRC0CNT) x 512.
27.6. CRC0 Bit Reverse Feature
CRC0 includes hardware to reverse the bit order of each bit in a byte as shown in Figure 27.1. Each byte
of data written to CRC0FLIP is read back bit reversed. For example, if 0xC0 is written to CRC0FLIP, the
data read back is 0x03. Bit reversal is a useful mathematical function used in algorithms such as the FFT.
Rev. 0.3
199