XE1203 ETC1 [List of Unclassifed Manufacturers], XE1203 Datasheet - Page 12

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

4.1.7
This feature can be activated by setting RTParam_Pattern to high while in receiver mode. The incoming NRZ bit
stream is compared with a pattern stored in PATParam_Pattern registers. The PATTERN output is driven by the
output of this comparator and is synchronized by DCLK. It is set to high when a matching condition is detected,
otherwise set to low. PATTERN output is updated at the rising edge of DCLK. The number of bits used for
comparison is defined in ADParam_Psize register and the number of tolerated errors for the pattern recognition is
defined in ADParam_Ptol register. The next figure shows the pattern matching operation.
12
Pattern recognition block
DATA
(NRZ)
DCLK
PATTERN
from a microcontroller
bit rate = 1154 bps
@1154 Hz
information data
@12.7 Kchps
Spread data
dclk
Pattern[x]
Bit N-x =
Figure 4 Data exchange during reception mode when barker scheme is used.
bit0
Figure 5. Pattern matching operation.
spread
bit0
Pattern[1]
Bit N-1 =
bit1
spread
bit1
Pattern[0]
Bit N =
bit2
spread
bit2
bit3
spread
bit3
bit4
spread
bit4
Data Sheet
XE1203
bit5
spread
bit5
D0308-214
bit6