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93C46B Datasheet(PDF) 6 Page - Microchip Technology |
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93C46B Datasheet(HTML) 6 Page - Microchip Technology |
6 / 12 page 93C46B DS21172D-page 6 Preliminary © 1997 Microchip Technology Inc. 3.6 ERASE/WRITE Disable and Enable (EWDS/EWEN) The device powers up in the ERASE/WRITE Disable (EWDS) state. All programming modes must be pre- ceded 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 EWDS and EWEN instructions. 3.7 READ The READ instruction outputs the serial data of the addressed memory location on the DO pin. A dummy zero bit precedes the 16-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). Sequen- tial read is possible when CS is held high. The memory data will automatically cycle to the next register and output sequentially. FIGURE 3-4: EWDS TIMING FIGURE 3-5: EWEN TIMING FIGURE 3-6: READ TIMING CS CLK DI 1 0 0 0 0 X ••• X TCSL 1 X CS CLK DI 0 0 1 1 X TCSL ••• CS CLK DI DO 1 1 0 An ••• A0 HIGH-Z 0 Dx ••• D0 Dx ••• D0 ••• Dx D0 |
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