HCS515_11 Datasheet, PDF (10/38 Pages) Microchip Technology – KEELOQ® Code Hopping Decoder stand-alone decoder

HCS515
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
TABLE 4-1: COMMAND ACTIVATION TIMES
Decoder State
While receiving transmissions
During the validation of a received transmission
During the update of the sync counters
During learn
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
Instruction
READ
WRITE
ACTIVATE_LRN
ERASE_ALL
PROGRAM
Command Byte
F0 HEX
E1 HEX
D2 HEX
C3 HEX
B4 HEX
service the command request. The response time
depends on the state of the decoder when the Com-
mand mode is requested.
Min
Max
—
2.5 ms BPWMAX = 2.7 ms
—
3 ms
—
40 ms
—
170 ms
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
DS40183E-page 10
© 2011 Microchip Technology Inc.