HCS500 datasheet(16/40 Pages) MICROCHIP

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HCS500

DS40153D-page 16

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)

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 crypt

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.

FIGURE 5-1:

PROGRAMMING WAVEFORM

DECODER

MSB

Command Byte

Start Command

TCLKL

TCLKH

TPP1

TDS

LSB

TPP3

TPP2

TCMD

LSB

Configuration Byte

CLK

μC DATA

MSB

TDATA

Most Significant Byte

TACK

TWT2

TAW

Acknowledge

MSB

Least Significant Byte

TDATA

TADDR

TPP4

DATA

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