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LE25CB5122M Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LE25CB5122M Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 13 page LE25CB5122M No.NA1679-11/13 5. Write (WRITE) The LE25CB5122M enables pages with up to 128bytes to be written. Any number of bytes from 1 to 128bytes can be written within the same sector page (page addresses : A15 to A7). “Figure 9 Write” shows the write timing waveforms, and Figure 12 shows a write flowchart. After the falling CS edge, the command (02H) is input followed by the 16-bit addresses (Add). The write data is then loaded until the rising CS edge, and the internal addresses (A6 to A0) are incremented (Add+1) every time the data is loaded in 1-byte increments. The data loading continues until the rising CS edge. If the data loaded has exceeded 128bytes, the 128bytes loaded last are written. The write data must be loaded in 1-byte increments, and the write operation is not performed at the rising CS edge occurring at any other timing. The write time is 5ms (max.) when 128bytes (1page) are written at one time. Figure 9 Write 6. Hold Function Using HOLD pin, the hold function suspends serial communication (it places it in the hold status). “Figure 10 HOLD” shows the timing waveforms. The device is placed in the hold status at the falling HOLD edge while the logic level of SCK is low, and it exits from the hold status at the rising HOLD edge. When the logic level of SCK is high, HOLD must not rise or fall. The hold function takes effect when the logic of CS is low, and the hold status is exited and serial communication is reset at the rising CS edge. In the hold status, the SO output is in the high-impedance state, and SI and SCK are “don’t care.” Figure 10 HOLD CS HOLD SCK SO Active Active HOLD tHS tHS tHH tHLZ tHH tHHZ High Impedance 7. Hardware Data Protection In order to protect against unintentional writing at power-on, the LE25CB5122M incorporates a power-on reset function. CS SCK SI SO 8CLK High Impedance Mode3 Mode0 0123 456 78 15 16 23 24 31 32 39 40 47 1047 Self-timed Write Cycle tWC 02h Add. Add. PD PD PD PD (00000010) (A15-A8) (A7-A0) (N) (N+1) (N+2) (N+127) |
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