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MCS3142-I/ST датащи(PDF) 8 Page - Microchip Technology

номер детали MCS3142-I/ST
подробное описание детали  MCS3142 Dual KEELOQ짰 Technology Encoder Data Sheet
PDF  37 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCS3142-I/ST датащи(HTML) 8 Page - Microchip Technology

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MCS3142
DS40001747A-page 8
 2014 Microchip Technology Inc.
3.1
Counter and Timer Protection
Because they are written during normal operation of
the device, the two synchronization counters, Reset
counter and time value receive special protection to
guard against data loss from unexpected power loss.
An 8-bit CRC is calculated and stored alongside each
variable. Further, each variable is duplicated in a
different portion of memory. Whenever a value is read,
the CRC is calculated and verified against the stored
value. If there is a mismatch, the second copy of the
data is read instead. The CRC calculation uses a
polynomial
represented
by
.
Example 3-1 describes a sample C function to compute
this value.
EXAMPLE 3-1:
CRC CALCULATION
x
8
x
4
x
3
x
2
1
++++
static uint8_t crc(const uint8_t* buffer, size_t len){
uint8_t bitcount;
uint8_t c = 0xFF;
while(len--)
{
c ^= *buffer++;
for(bitcount = 0; bitcount < 8; bitcount++){
if((c & 0x80)!= 0) {
c <<= 1;
c ^= 0x1D;
}else{
c <<= 1;
}
}
}
return ~c;
}



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