Datasheet

Section 25 Electrical Characteristics
Page 1296 of 1384 R01UH0310EJ0500 Rev. 5.00
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
Notes: 1. When programming is to be performed multiple times on a system, reduce the effective number of
programming operations by shifting the writing addresses in sequence and so on until the
remaining blank area is as small as possible and only then erasing the entire block once. For
example, if sets of 16 bytes are being programmed, erasing the block once after programming the
maximum number of sets (256) minimizes the effective number of programming operations.
We recommend keeping information on the number of times erasure is performed for each block,
and setting up the limit on the number of times.
2. If an erase error occurs during erasure, execute the clear status command and then the erase
command at least 3 times until the erase does not recur.
*1. Determination of the number of times for programming/erasure operations.
Number of times programming/erasure is performed in each block.
When the number of times for programming/erasure operations is n (n = 100), data can be erased
n times in each block.
For example, if programming of 4 bytes is done 1024 times, each at a different address in a 4-
kbyte per block, and the block is then erased, this counts as programming/erasure one time.
However, programming of any location in a block multiple times is not possible (overwriting is
prohibited).
*2. This is the number of times for which all electrical characteristics are guaranteed.