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V
CC
RES
FWE
Note: When using other than the automatic write mode and automatic erase mode, drive the FWE
input pin low.
Figure 22-26 Oscillation Stabilization Time, Boot Program Transfer Time, and
22.11.9 Notes on Memory Programming
1. When programming addresses which have previously been programmed, carry out auto-
erasing before auto-programming.
2. When performing programming using programmer mode on a chip that has been
programmed/erased in an on-board programming mode, auto-erasing is recommended before
carrying out auto-programming.
Notes: 1. The flash memory is initially in the erased state when the device is shipped by Hitachi.
For other chips for which the erasure history is unknown, it is recommended that auto-
erasing be executed to check and supplement the initialization (erase) level.
2. Auto-programming should be performed once only on the same address block.
Additional programming cannot be performed on previously programmed address
blocks.
950
Memory read
mode
Command
wait state
t
t
osc1
bmv
Power-Down Sequence
Command wait state
Auto-program mode
Normal/abnormal
Auto-erase mode
end decision
t
dwn
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