HCS515 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

HCS515

KEELOQ Code Hopping Decoder

Microchip Technology 

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

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

While receiving transmissions

During the validation of a received transmission

During the update of the sync counters

During learn

TABLE 4-2: DECODER COMMANDS

Instruction

Command Byte

READ

WRITE

ACTIVATE_LRN

ERASE_ALL

PROGRAM

F016

E116

D216

C316

B416

Min

Max

—

2 1/2 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

© 1998 Microchip Technology Inc.

Preliminary

DS40183A-page 9

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