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AT89LP6440 Datasheet(PDF) 160 Page - ATMEL Corporation |
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AT89LP6440 Datasheet(HTML) 160 Page - ATMEL Corporation |
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160 / 194 page  160 3706A–MICRO–9/09 AT89LP6440 - Preliminary Figure 25-3. AT89LP6440 Memory Organization 25.3 Command Format Programming commands consist of an opcode byte, two address bytes, and zero or more data bytes. In addition, all command packets must start with a two-byte preamble of AAH and 55H. The preamble increases the noise immunity of the programming interface by making it more dif- ficult to issue unintentional commands. Figure 25-4 on page 161 shows a simplified flow chart of a command sequence. A sample command packet is shown in Figure 25-5 on page 161. The SS pin defines the packet frame. SS must be brought low before the first byte in a command is sent and brought back high after the final byte in the command has been sent. The command is not complete until SS returns high. Command bytes are issued serially on MOSI. Data output bytes are received seri- ally on MISO. Packets of variable length are supported by returning SS high when the final required byte has been transmitted. In some cases command bytes have a don’t care value. Don’t care bytes in the middle of a packet must be transmitted. Don’t care bytes at the end of a packet may be ignored. Page oriented instructions always include a full 16-bit address. The higher order bits select the page and the lower order bits select the byte within that page. The AT89LP6440 allocates 6 bits for byte address, 1 bit for low/high half page selection and 9 bits for page address. The half page to be accessed is always fixed by the page address and half select as transmitted. The byte address specifies the starting address for the first data byte. After each data byte has been transmitted, the byte address is incremented to point to the next data byte. This allows a page command to linearly sweep the bytes within a page. If the byte address is incremented past the last byte in the half page, the byte address will roll over to the first byte in the same half page. While loading bytes into the page buffer, overwriting previously loaded bytes will result in data corruption. Page 511 Low Page 510 Low User Fuse Row User Signature Array Atmel Signature Array Code Memory 00 3F 0000 FFFF Page 0 Low 1000 3FFF Data Memory Page 511 High Page 510 High 40 7F Page 63 High Page 63 Low Page 0 Low Page 0 Low Page 1 Low Page 0 High Page 1 High Page 0 Low Page 1 Low Page 0 Low Page 1 High Page 1 High Page 0 High Page 0 High 00 3F Page Buffer |
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