HCS515 Просмотр технического описания (PDF) - Microchip Technology

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HCS515

KEELOQ Code Hopping Decoder

Microchip Technology 

HCS515

5.2 Programming Waveform

The programming command consists of the following:

• Command Request Sequence (A to B)

• Command Byte (B to C)

• Configuration Byte (C to D)

• Manufacturer’s Code Eight Data Bytes (D to G)

• Activation and Acknowledge Sequence (G to H)

FIGURE 5-1: PROGRAMMING WAVEFORM

TCLKL

TCMD

TADDR

TPP1 TPP3

TCLKH TDS

5.3 Programming Data String

A total of 80 bits are clocked into the decoder. The 8-bit

command byte is clocked in first, followed by the 8-bit

configuration byte and the 64-bit manufacturer’s code.

The data must be clocked in Least Significant Bit (LSB)

first. The decoder will then encrypt the manufacturer’s

code using the decoder’s unique 64-bit EEPROM

encoder decryption key. After completion of the pro-

gramming EEPROM, the decoder will acknowledge by

taking the data line high (G to H). If the data line goes

high within 30 ms after the clock goes high, program-

ming also fails.

TDATA

TDATA TACK

TWT2

CLK

µC DATA

LSB

TPP2TPP4

MSB LSB

MSB

MSB

LSB

MSB

TAW

DECODER DATA

Start Command

Command Byte

Configuration Byte Least Significant Byte

A

B

C

D

E

Most Significant Byte Acknowledge

F

G

H

© 1998 Microchip Technology Inc.

Preliminary

DS40183A-page 15

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