Author Topic: P89LV51RD2 security bit  (Read 8807 times)


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P89LV51RD2 security bit
« on: November 15, 2004, 10:29:04 AM »
Hi all,

The datasheet of P89LV51RD2 says that:
"When the Security Bit is activated all parallel programming commands except for Chip-Erase are ignored (thus the device cannot be read). However, ISP reads of the user

Andy Ayre

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Re: P89LV51RD2 security bit
« Reply #1 on: November 15, 2004, 10:52:06 AM »
Yes, it is the serial number functionality that can disable ISP. When the serial number is programmed you cannot use ISP, except for erase, unless the serial number is entered or the device is erased.

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