HCS500_15 Datasheet, PDF (11/42 Pages) Microchip Technology – KEELOQ® Code Hopping Decoder

HCS500
4.2.3 COMMAND ACTIVATION TIMES
4.2.4 DECODER COMMANDS
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
Command mode is requested.
TABLE 4-1: COMMAND ACTIVATION TIMES
The command byte specifies the operation required by
the controlling microcontroller. Table 4-2 lists the
commands.
Decoder State
Min
Max
While receiving transmissions
—
During the validation of a received transmission
—
During the update of the sync counters
—
During learn
—
Note: *These parameters are characterized but not tested.
2.5 ms BPW_MAX = 2.7 ms
3 ms
40 ms
170 ms
TABLE 4-2: DECODER COMMANDS
Instruction
Command Byte
READ
WRITE
ACTIVATE_LRN
ERASE_ALL
PROGRAM
F0₁₆
E1₁₆
D2₁₆
C3₁₆
B4₁₆
Operation
Read a byte from user EEPROM
Write a byte to user EEPROM
Activate a learn sequence on the decoder
Activate an erase all function on the decoder
Program manufacturer’s code and Configuration byte
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DS40000153E-page 11