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HCS515 Datasheet(PDF) 16 Page - Microchip Technology |
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HCS515 Datasheet(HTML) 16 Page - Microchip Technology |
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16 / 38 page  HCS515 DS40183E-page 16 © 2011 Microchip Technology Inc. 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 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. FIGURE 5-1: PROGRAMMING WAVEFORM MSB A Command Byte START Command TCLKL TCLKH TDS BC LSB TSTART TDATA D TDATA E Configuration Byte Least Significant Byte TDATA TREQ TRESP CLK μC Data MSB LSB MSB LSB HCS515 Data TDATA G Most Significant Byte H TACK TWTH Acknowledge F TWTL LSB MSB TABLE 5-1: PROGRAMMING COMMAND Symbol Parameters Sugg. Value Min. Max. Units TREQ Command request time d.o.d. 0.005 500 ms TRESP Acknowledge time 100 10 1000 μs TSTART Command request to first command bit 100 20 1000 μs TCLKH Clock high time 100 20 1000 μs TCLKL Clock low time 100 20 1000 μs TDS Data hold time 50 14 1000 μs TDATA Command last bit to data first bit 100 10 1000 μs TACK Command acknowledge time d.o.d. 30 240 ms TWTH Acknowledge respond time 100 20 1000 μs TWTL Clock low to next command 100 10 — μs Note: d.o.d. - depends on decoder status These parameters are characterized but not tested |
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