Rev. 1.0, 02/00, page 168 of 1141
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
Symbol
Min
Max
Unit
Notes
Standby release
(oscillation stabilization time)
t
osc1
10
ms
Writer mode setup time
t
bmv
10
ms
V
CC
hold time
t
dwn
0
ms
V
CC
RES
FWE
Memory read
mode
Command wait
state
Command
wait state
Normal/abnormal
end identifica-
tion
Auto-program mode
Auto-erase mode
t
osc1
t
bmv
t
dwn
Note: Except in auto-program mode and auto-erase mode, drive the FWE input pin low.
Don't care
Don't care
Figure 7.23 Oscillation Stabilization Time,
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.