HCS500 datasheet(15/24 Pages) MICROCHIP

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HCS500

Preliminary

DS40153B-page 15

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

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.

FIGURE 5-1:

PROGRAMMING WAVEFORM

DECODER DATA

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

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