In SX Microcontrollers, SX/B Compiler and SX-Key Tool, John Kauffman wrote:

Adding delay between write and read sounded good:
     I replaced code as posted (and added bit VAR named ackbit)
     For good measure, added a Rip van Winkle-sized pause between write & read.
New version (-02) attached.

Still same result: initial display of value works, then nothing.

I tried another address $0A0A in case %0000 was reserved - no change.

What really has me stymied is that the LedReadFlag does not even come on. It seems that the read part of the code is never executed. 

I don't have a second 24LC32A to swap for IC check. Can I try swapping in 24LC256?

 

Basics:

Independent check of LedReadFlag circuit is OK.

EEPROM Pins 1-3 (A0-A2) and pin 7 (WP) are grounded, like in SX/B Help Example wiring diagram.

EEPROM pins 5 & 6 have pull-ups (1k instead of 4.7 k of diagram).

I'm using a Murata 400 resonator. I program, then remove the key, then reset to test.

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