HCS500 datasheet(9/24 Pages) MICROCHIP

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HCS500

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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