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25LC1024-E/P датащи(PDF) 7 Page - Microchip Technology |
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25LC1024-E/P датащи(HTML) 7 Page - Microchip Technology |
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7 / 32 page ![]() © 2008 Microchip Technology Inc. DS22064C-page 7 25LC1024 Read Sequence The device is selected by pulling CS low. The 8-bit READ instruction is transmitted to the 25LC1024 followed by the 24-bit address, with seven MSBs of the address being “don’t care” bits. After the correct READ instruction and address are sent, the data stored in the memory at the selected address is shifted out on the SO pin. The data stored in the memory at the next address can be read sequentially by continuing to provide clock pulses. The internal Address Pointer is automatically incremented to the next higher address after each byte of data is shifted out. When the highest address is reached (1FFFFh), the address counter rolls over to address, 00000h, allowing the read cycle to be contin- ued indefinitely. The read operation is terminated by raising the CS pin (Figure 2-1). FIGURE 2-1: READ SEQUENCE SO SI SCK CS 0 23456789 10 11 29 30 31 32 33 34 35 36 37 38 39 1 01 0 0 0 0 01 23 22 21 20 210 765 43210 Instruction 24-bit Address Data Out High-Impedance |
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