HCS412I MICROCHIP [Microchip Technology], HCS412I Datasheet - Page 23

• Manufacturer Part Number: HCS412I
• Description: KEELOQ Code Hopping Encoder and Transponder
• Manufacturer: MICROCHIP [Microchip Technology]

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