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HCS473 bảng dữ liệu(PDF) 13 Page - Microchip Technology

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 2000-2013 Microchip Technology Inc.
Preliminary
DS40035D-page 13
HCS473
3.1.3
CODE HOPPING MODULATION
FORMAT
The data modulation format is selectable between
Pulse Width Modulation (PWM) and Manchester using
the modulation select (MSEL) configuration option.
Regardless of the modulation format, each code word
contains a leading preamble and a synchronization
header to wake the receiver and provide synchroniza-
tion events for the receive routine. Each code word also
contains a trailing guard time to separate code words.
Manchester encoding further includes a leading data ‘1’
START pulse and closing 1 RFTE STOP pulse around
each data block.
The same code word repeats as long as the same input
pins remain active, until a timeout occurs or a delayed
seed transmission is activated.
The modulated data timing is typically referred to in
multiples of a basic Timing Element (RFTE). ‘RF’ TE
because the DATA pin output is typically sent through a
RF transmitter to the decoder or transponder reader.
RFTE may be selected using the RF Transmission
Baud
Rate
(RFBSL)
configuration
option
(Section 3.1.4.13).
FIGURE 3-3:
PWM TRANSMISSION FORMAT (MSEL = 0)
FIGURE 3-4:
MANCHESTER TRANSMISSION FORMAT (MSEL = 1)
TOTAL TRANSMISSION
:
Preamble Sync Encrypt
Fixed
Guard
1 CODE WORD
Preamble Sync
Encrypt
LOGIC "1"
Guard
Time
Preamble
Encrypted
Portion
Fixed Code
Portion
LOGIC "0"
Header
TE
TE
TE
CODE WORD
TOTAL TRANSMISSION:
CODE WORD
Guard
Header
Encrypted
Fixed Code
START bit
STOP bit
Time
Portion
Portion
bit 0 bit 1 bit 2
LOGIC “0”
LOGIC “1”
TE
TE
Preamble
Preamble Sync Encrypt
Fixed
Guard
1 CODE WORD
Preamble Sync
Encrypt



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