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HCS515-I-P Datasheet(PDF) 10 Page - Microchip Technology

Part # HCS515-I-P
Description  KEELOQ Code Hopping Decoder
Download  32 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS515-I-P Datasheet(HTML) 10 Page - Microchip Technology

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HCS515
DS40183D-page 10
© 2002 Microchip Technology Inc.
4.2.3
COMMAND ACTIVATION TIMES
The command activation time (Table 4-1) is defined as
the maximum time the microcontroller has to wait for a
response from the decoder. The decoder will abort and
service the command request. The response time
depends on the state of the decoder when the Com-
mand mode is requested.
TABLE 4-1:
COMMAND ACTIVATION TIMES
4.2.4
DECODER COMMANDS
The command byte specifies the operation required by
the controlling microcontroller. Table 4-2 lists the com-
mands.
TABLE 4-2:
DECODER COMMANDS
Decoder State
Min
Max
While receiving transmissions
—
2.5 ms BPWMAX = 2.7 ms
During the validation of a received transmission
—
3 ms
During the update of the sync counters
—
40 ms
During learn
—
170 ms
Instruction
Command Byte
Operation
READ
F0 HEX
Read a byte from user EEPROM
WRITE
E1 HEX
Write a byte to user EEPROM
ACTIVATE_LRN
D2 HEX
Activate a learn sequence on the decoder
ERASE_ALL
C3 HEX
Activate an erase all function on the decoder
PROGRAM
B4 HEX
Program manufacturer’s code and configuration byte


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