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M95256-R Datasheet(PDF) 21 Page - STMicroelectronics |
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M95256-R Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 43 page  M95256, M95256-W, M95256-R Instructions 21/43 5.5 Read from Memory Array (READ) As shown in Figure 9, to send this instruction to the device, Chip Select (S) is first driven low. The bits of the instruction byte and address bytes are then shifted in, on Serial Data input (D). The address is loaded into an internal address register, and the byte of data at that address is shifted out, on Serial Data output (Q). If Chip Select (S) continues to be driven low, the internal address register is automatically incremented, and the byte of data at the new address is shifted out. When the highest address is reached, the address counter rolls over to zero, allowing the Read cycle to be continued indefinitely. The whole memory can, therefore, be read with a single READ instruction. The Read cycle is terminated by driving Chip Select (S) high. The rising edge of the Chip Select (S) signal can occur at any time during the cycle. The first byte addressed can be any byte within any page. The instruction is not accepted, and is not executed, if a Write cycle is currently in progress. Figure 9. Read from Memory Array (READ) sequence 1. The most significant address bit (b15) is Don’t Care. C D AI01793D S Q 15 2 1 3456789 10 20 21 22 23 24 25 26 27 14 13 3210 28 29 30 76543 1 7 0 High Impedance Data Out 1 Instruction 16-Bit Address 0 MSB MSB 2 31 Data Out 2 |
Similar Part No. - M95256-R |
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Similar Description - M95256-R |
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