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AK6480C Datasheet(PDF) 6 Page - Asahi Kasei Microsystems |
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AK6480C Datasheet(HTML) 6 Page - Asahi Kasei Microsystems |
6 / 15 page ASAHI KASEI [AK6480C/81] DAS04E-00 2005/03 - 6 - Write The write instruction is followed by 16 bits of data to be written into the specified address. After the 32nd rising edge of SK to read D0 in, the AK6480C/81C will be put into the automatic write time-out period. During the automatic write time-out period ( Busy status) and while entering write instruction, the RESET pin should be low level. If the RESET pin is set to high level during the automatic write time-out period, the AK6480C/81C stops execution of internal programming and the device returns to ready status. In this case the word data of the specified address will be incomplete. When inputting the new instruction after RESET, the CS pin should be set to high level. When the RESET pin is kept at high level, the write is not executed. This becomes write protection function. The CS pin need not be high level during automatic write time-out period ( Busy status). WRITE (AK6480C) WRITE (AK6481C) Page Write AK6480C/81C has Page Write mode, which can write the data within 8 words with one programming cycle. The input data sent to the shift register within 8 words. After the instruction input, the internal programming cycle starts when CS pin changes low to high. After the instructions are inputted, CS pin should change low to high after the last data bit (D0, AK6481C: D15) inputs and before next SCK clock rises. Page Write function can start only at this timing. After the receipt of each word, the three lower order address pointer bits internally incremented by one. The higher order seven bits of the word address remains constant. When the highest address is reached ”XX XXXX X111”, the address counter rolls over to address ”XX XXXX X000” allowing the page write cycle to be continued indefinitely. If AK6480C/81C is transmitted more than 8 words, the address counter will ”roll over” and the previously written data will be overwritten. When AK6480C/81C is transmitted 10 words, ninth word will be overwritten to first word, and tenth word will be overwritten to second word. During the automatic write time-out period ( Busy status) and while entering Page Write 0 SK CS BUSY 1 1 RESET Hi-Z DI DO RDY/ tE/W 2 3 4 5 6 7 8 9 10 15 16 17 18 30 31 32 0 1 0 0 1 A8 A7 A6 A1 A0 D15 D14 D2 D1 D0 0 30 31 32 10 15 16 17 18 0 0 0 SK CS BUSY 1 1 RESET Hi-Z DI DO RDY/ 2 3 4 5 6 1 1 7 8 9 A0 A1 A2 A7 A8 D0 D1 D13 D14 D15 tE/W |
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