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HCS500 Datasheet(PDF) 9 Page - Microchip Technology

Part # HCS500
Description  KEELOQ CODE HOPPING ENCODER
Download  24 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS500 Datasheet(HTML) 9 Page - Microchip Technology

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HCS500
© 1997 Microchip Technology Inc.
Preliminary
DS40153B-page 9
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.
4.2.4
DECODER COMMANDS
The command byte specifies the operation required by
the controlling microcontroller. Table 4-2 lists the com-
mands.
TABLE 4-1:
COMMAND ACTIVATION TIMES
Decoder State
Min
Max
While receiving transmissions
—
2 1/2 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
TABLE 4-2:
DECODER COMMANDS
Instruction
Command Byte
Operation
READ
F016
Read a byte from user EEPROM
WRITE
E116
Write a byte to user EEPROM
ACTIVATE_LRN
D216
Activate a learn sequence on the decoder
ERASE_ALL
C316
Activate an erase all function on the decoder
PROGRAM
B416
Program manufacturer’s code and configuration byte


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