HCS412 Datasheet, PDF (23/44 Pages) Microchip Technology – KEELOQ Code Hopping Encoder and Transponder

HCS412
TABLE 4-5: LIST OF WRITE COMMANDS
Command
Description
Expected data In
Response if Write is Successful
01001
01010
01011
01100
01101
01110
01111
Write Configuration word
28-bit Transport code; 16-Bit
configuration word
Write low serial number 28-bit Transport code; Least Significant
16 bits of the serial number (SER0)
Write high serial number 28-bit Transport code; Most Significant
16 bits of the serial number (SER1)
Write user EEPROM 0
16 Bit User EEPROM USR0
Write user EEPROM 1
16 Bit User EEPROM USR1
Write user EEPROM 2
16 Bit User EEPROM USR2
Write user EEPROM 3
16 Bit User EEPROM USR3
Write Acknowledge pulse
Write Acknowledge pulse
Write Acknowledge pulse
Write Acknowledge pulse
Write Acknowledge pulse
Write Acknowledge pulse
Write Acknowledge pulse
FIGURE 4-5: WRITE TO SERIAL NUMBER OR CONFIGURATION
Activate
Field ^ACK
Delay to
Command
Command
Delay to
TCODE
28-bit
Transport
Code
Delay to
Data
Delay before Write
16 bits Data _{Write ACK ACK}
TPU
TATO
TOTD
TTTD
TWR
ACK
2 LFTE
Start
Communication from reader to HCS412
Communication from HCS412 to reader
Command
2 LFTE
Start
28-bit
Transport
Code _{2 LFTE}
Start
16
Data Bits
Write Delay ACK
FIGURE 4-6: WRITE TO USER AREA
Activate
Field ^ACK
Delay to
Command
Command
Delay to
Delay before Write
Data ^{16 bits Data} Write ACK ACK
TPU
TATO
TOTD
TWR
ACK
2 LFTE
Start
Communication from reader to HCS412
Communication from HCS412 to reader
Command
2 LFTE
Start
16
Write Delay ACK
Data Bits
© 2002 Microchip Technology Inc.
Preliminary
DS41099C-page 23