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93LC56A Datasheet(PDF) 9 Page - Microchip Technology |
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93LC56A Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 28 page  © 2007 Microchip Technology Inc. DS21794E-page 9 93AA56A/B/C, 93LC56A/B/C, 93C56A/B/C 2.6 Erase/Write Disable and Enable (EWDS/EWEN) The 93XX56A/B/C 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 opera- tions. Execution of a READ instruction is independent of both the EWEN and EWDS instructions. FIGURE 2-5: EWDS TIMING FIGURE 2-6: 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 (if ORG pin is low or A-Version devices) or 16-bit (if ORG pin is high or B-version devices) output string. The output data bits will toggle on the rising edge of the CLK and are stable after the spec- ified 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. FIGURE 2-7: READ TIMING CS CLK DI 10 00 0 x ••• x TCSL 1x CS CLK DI 00 1 1 x TCSL ••• CS CLK DI DO 11 0 An ••• A0 High-Z 0 Dx ••• D0 Dx ••• D0 ••• Dx D0 |
Número de pieza similar - 93LC56A |
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Descripción similar - 93LC56A |
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