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AT34C02U3-10UU-1.8 Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT34C02U3-10UU-1.8 Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 21 page 10 AT34C02 0958Q–SEEPR–1/07 Write Protection The software write protection, once enabled, permanently write protects only the first- half of the array (00H - 7FH) while the hardware write protection, via the WP pin, is used to protect the entire array. SOFTWARE WRITE PROTECTION: The software write protection is enabled by send- ing a command, similar to a normal write command, to the device which programs the write protect register. This must be done with the WP pin low. The write protect register is programmed by sending a write command with the device address of 0110 instead of 1010 with the address and data bit being don’t cares (see Figure 7 on page 11). Once the software write protection has been enabled, the device will no longer acknowledge the 0110 control byte. The software write protection cannot be reversed even if the device is powered down. The write cycle time must be observed. HARDWARE WRITE PROTECTION: The WP pin can be connected to VCC, GND, or left floating. Connecting the WP pin to VCC will write protect the entire array, regardless of whether or not the software write protection has been enabled. The software write protection register cannot be programmed when the WP pin is connected to VCC. If the WP pin is connected to GND or left floating, the write protection mode is determined by the status of the software write protect register. |
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