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7.8.9
Writer Mode Transition Time
Commands cannot be accepted during the oscillation stabilization period or the writer mode setup
period. After the writer mode setup time, a transition is made to memory read mode.
Table 7.19 Command Wait State Transition Time Specifications
Item
Standby release
(oscillation stabilization time)
Writer mode setup time
V
hold time
CC
V
CC
RES
FWE
Note: Except in auto-program mode and auto-erase mode, drive the FWE input pin low.
Boot Program Transfer Time, and Power Supply Fall Sequence
7.8.10
Notes on Memory Programming
• When programming addresses which have previously been programmed, carry out auto-
erasing before auto-programming.
• When performing programming using writer 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.
Rev. 1.0, 02/00, page 168 of 1141
Symbol
t
osc1
t
bmv
t
dwn
t
t
osc1
bmv
Memory read
mode
Command wait
state
Figure 7.23 Oscillation Stabilization Time,
Min
Max
10
10
0
Auto-program mode
Auto-erase mode
Unit
Notes
ms
ms
ms
t
dwn
Command
Don't care
wait state
Normal/abnormal
end identifica-
tion
Don't care
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