Dear Oleg,

"Yes, and so you have read there next:

Figure 16 shows the signals and timing involved in program fetches when the Program Memory is external. If an access to external Data Memory occurs, as shown in Figure 16b, two PSENs are skipped, because the address and data bus are being used for the Data Memory access. "

No. I have not read that in so great a detail ! Thanks for the pointer.

Raghu