HCS410-IP Microchip Technology, HCS410-IP Datasheet - Page 16

• Manufacturer Part Number: HCS410-IP
• Description: KEELOQ CODE HOPPING ENCODER AND TRANSPONDER
• Manufacturer: Microchip Technology

HCS410
2.4.3
The responses from the HCS410 are in PPM format.
See Figure 2-17 for additional information
2.4.4
The 16/32-bit response to a 16/32-bit challenge, is
transmitted once, after which the device is ready to
accept another command. The same applies to the
result of a Read command. The opcode written to the
device specifies the challenge length and algorithm
used.
2.4.5
The decoder can write to USER[0:3], SER[0:1], and the
configuration word in the EEPROM.
After the HCS410 has written the word into the
EEPROM, it will give two acknowledge pulses (T
and T
When writing to the serial number or configuration
word, the user must send the transport code before the
write will begin (Section 3.4) .
FIGURE 2-18: IFF INDUCTIVE IN RF OUT
DS40158C-page 16
Note:
LCI0/1
PWM
E
apart) on the LC pins.
HCS410 RESPONSES
IFF RESPONSE
IFF WRITE
If the configuration word is written, the
device must be reset to allow the new con-
figuration settings to come into effect.
Select ACK
Encoder
Opcode
(Read)
Response
E
(16 bits)
wide
Preliminary
Preamble
2.4.6
The decoder can read USER[0:3], SER[0:1], and the
configuration word in the EEPROM. After the data has
been read, the device is ready to receive a command
again.
Each read command is followed by a 16-bit data
response. The response always starts with a leading
preamble of 01
2.4.7
Upon receiving a programming opcode and the trans-
port code, the EEPROM is erased (Section 3.4).
Thereafter, the first 16 bits of data can be written. After
indicating that a write command has been successfully
completed the device is ready to receive the next 16
bits. After a complete memory map was received, it will
be transmitted in PPM format on the LC pins as 16-bit
words. This enables wireless programming of the
device.
After the EEPROM is erased, the configuration word is
reloaded. This results in oscillator tuning bits of 0000
being used during programming. When using IFF pro-
gramming, the user should read the configuration word
and store the oscillator bits in the memory map to be
programmed. A program command should be sent and
the next set of ACK pulses transmitted by the HCS410
should be used to determine the T
command can then be sent, and the device pro-
grammed using the T
Header
IFF READ
IFF PROGRAMMING
Response
16-bit
32-bit Response
2
Response
and then the 16-bits of data.
(32 bits) Fixed Code
E
Response
just calibrated.
16-bit
1997 Microchip Technology Inc.
(37 bits)
E
. A second program
Next
Ack