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Is there way to retrieve verification address data with no FF writing?

Latest Updated:01/18/2008

Question:

During the flow of program verification mode FF is dummy written into verification addresses. Is there a way to retrieve verification address data without writing to FF?

Answer:

No, there is no way to retrieve verification address data without dummy writing. Because Flash writing/erasing/verification/etc. requires high voltage, the CPU cannot directly access internal Flash memory. Therefore, an internal buffer is used as an intermediary to implement data verification. Since the purpose of dummy write is to latch to the starting address of the verification addresses stored in the Flash module, strictly speaking H'FF is not essential. Consequently, please be advised that normal operation is not possible even when attempting to read verification data directly from the CPU.
Suitable Products
H8S/2678, 2678R
H8S/2668
H8S/2649
H8S/2648, 2646
H8S/2643
H8S/2630, 2639, 2638, 2636, 2635
H8S/2633
H8S/2628
H8S/2615
H8S/2612
H8S/2472, 2463, 2462
H8S/2378, 2378R
H8S/2368
H8S/2398, 2357
H8S/2345
H8S/2339
H8S/2329
H8S/2319
H8S/2282, 2280
H8S/2268, 2264
H8S/2258, 2239, 2238, 2237, 2227
H8S/2245
H8S/2215
H8S/2214
H8S/2218, 2212
H8S/2168
H8S/2148, 2144
H8S/2144B,2134B
H8S/2140B
H8S/2138, 2134
H8S/2111B
H8S/2110B