hcs410 Microchip Technology Inc., hcs410 Datasheet - Page 14

• Manufacturer Part Number: hcs410
• Description: Keeloq Code Hopping Encoder And Transponder Keeloq Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

HCS410
FIGURE 2-17: DECODER IFF COMMANDS AND WAVEFORMS
TABLE 2-3:
DS40158E-page 14
Time Element
PPM Command Bit Time
PPM Response Bit Time
PPM Command Minimum High Time
Response Time (Minimum for Read)
Opcode to Data Input Time
Transport Code to Data Input Time
IFF EEPROM Write Time (16 bits)
Read
Write/Program
Challenge
Encoder Select
IFFB = 0
IFFB = 1
Data = 1
Data = 0
Data = 1
Data = 0
Parameter
3T
ACK pulses
E
Ack pulses
ACK pulses
ACK pulses
3T
IFF TIMING PARAMETERS
E
T
E
T
Start
2 T
E
E
Opcode
Opcode
Symbol
T
T
T
T
T
T
T
BITC
BITR
PMH
OTD
T
TTD
WR
RT
E
Preliminary
T
OTD
T
OTD
Minimum
T
RT
Only when writing Serial
Number, Config or IFF
3.5
5.5
1.5
6.5
1.8
6.8
—
—
—
—
—
Transport
32 bits
Code
programming
Serial number
1 to 32 bits
Preamble
Challenge
16/32 bits
0 1
Response
16 bits
T
T
Typical
TTD
BITC
200
100
—
—
—
—
—
4
6
2
3
Repeat 18 times for programming
16 bits
T
Data
WR
T
 2001 Microchip Technology Inc.
WR
Maximum
Preamble
0 1
30
—
—
—
—
—
—
—
—
—
—
Response
16/32 bits
Writing
T
WR
Encoder
Select
ACK
Units
ms
ms
ms
ms
µs
T
T
T
E
E
E