HCS500 데이터 시트보기 (PDF) - Microchip Technology

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HCS500

KEELOQ Code Hopping Decoder

Microchip Technology 

HCS500

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 key. After completion of the programming

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, programming 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

© 1997 Microchip Technology Inc.

Preliminary

DS40153B-page 15

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