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93AA46AE48 Datasheet(PDF) 8 Page - Microchip Technology |
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93AA46AE48 Datasheet(HTML) 8 Page - Microchip Technology |
8 / 26 page 93AA46AE48 DS20005229C-page 8 2013-2016 Microchip Technology Inc. 2.6 Erase/Write Disable and Enable (EWDS/EWEN) The 93AA46AE48 powers up in the Erase/Write Disable (EWDS) state. All programming modes must be preceded by an Erase/Write Enable (EWEN) instruction. Once the EWEN instruction is executed, programming remains enabled until an EWDS instruction is executed or Vcc is removed from the device. To protect against accidental data disturbance, the EWDS instruction can be used to disable all erase/write functions and should follow all programming operations. Execution of a READ instruction is independent of both the EWEN and EWDS instructions. FIGURE 2-3: EWDS TIMING FIGURE 2-4: EWEN TIMING 2.7 Read The READ instruction outputs the serial data of the addressed memory location on the DO pin. A dummy zero bit precedes the 8-bit output string. The output data bits will toggle on the rising edge of the CLK and are stable after the specified time delay (TPD). Sequential read is possible when CS is held high. The memory data will automatically cycle to the next register and output sequentially. CS CLK DI 10 00 0 x ••• x TCSL 1x CS CLK DI 00 1 1 x TCSL ••• |
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