XE1203 ETC1 [List of Unclassifed Manufacturers], XE1203 Datasheet - Page 29

• Manufacturer Part Number: XE1203
• Description: Low-Power, integrated UHF transceiver
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

5.2.7
This register holds the user supplied reference pattern of 8, 16, 24, or 32 bits (see ADParam_Psize parameter).
The first byte of this pattern is always stored in the byte at address A[4:0] = 10011. Depending on the pattern size
the pattern values stored in addresses 10011, 10100, 10101 and 10110. The addresses 10011, 10100, 10101 and
10110 hold the first, second, third and fourth bytes of the reference pattern value respectively. The MSB bit of the
reference pattern is always the bit 7 of the address 10011.
When compared to the demodulated bit stream, the last bit received is compared to the LSB bit in the Pattern
register. The “oldest” bit received (the first of the last 8, 16, 24, or 32 received bits, depending on ADParam_Psize)
is compared with the bit 7 of byte address 10011 (the MSB).
Example of pattern recognition with a 32-bit pattern:
Example of pattern recognition with an 8-bit pattern:
29
PATParam_Pattern
previous bits from
Bit 7
Bit 7
101 10010011
101 10010011
Byte Address
Byte Address
Pattern register
demodulator
10010011
10010011
10011
10011
Name
Bit 0
Bit 0
previous
demodulator
Bit 7
Bit 7
Bits
7-0
last bit received
Byte Address
Byte Address
10101010
10101010
Xxxxxxxx
10100
10100
bits
Bit 0
Bit 0
Byte Address
from
10011
10100
10101
10110
Bit 7
Bit 7
Byte Address
Byte Address
10010011
10010011
Xxxxxxxx
10101
10101
1
2
3
4
st
nd
rd
th
byte of the reference pattern
byte
byte
byte
Bit 0
Bit 0
Description
last bit received
Data Sheet
XE1203
Bit 7
Bit 7
Byte Address
Byte Address
10101010
10101010
Xxxxxxxx
D0308-214
10110
10110
Bit 0
Bit 0