XE1203 データシートの表示（PDF） - Unspecified

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XE1203

433MHz / 868MHz / 915MHz Low-power, integrated UHF transceiver

Unspecified 

Data Sheet

XE1203

5.2.7 Pattern register

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).

Name

Bits

PATParam_Pattern

7-0

Byte Address

10011

10100

10101

10110

Description

1st byte of the reference pattern

2nd byte

3rd byte

4th byte

Example of pattern recognition with a 32-bit pattern:

Byte Address

10011

Bit 7

Bit 0

10010011

101 10010011

Byte Address

10100

Bit 7

Bit 0

10101010

10101010

previous bits

demodulator

from

Byte Address

10101

Bit 7

Bit 0

10010011

10010011

Byte Address

10110

Bit 7

Bit 0

10101010

10101010

last bit received

Example of pattern recognition with an 8-bit pattern:

Byte Address

10011

Bit 7

Bit 0

10010011

101 10010011

Byte Address

10100

Bit 7

Bit 0

Xxxxxxxx

previous bits from

demodulator

last bit received

Byte Address

10101

Bit 7

Bit 0

Xxxxxxxx

Byte Address

10110

Bit 7

Bit 0

Xxxxxxxx

29

D0308-214

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