Rev. 2.0, 11/00, page 216 of 1037
8.8.9
Programmer Mode Transition Time
Commands cannot be accepted during the oscillation stabilization period or the programmer
mode setup period. After the programmer mode setup time, a transition is made to memory read
mode.
Table 8.20 Command Wait State Transition Time Specifications
Item
Symbol
Min
Max
Unit
Standby release
(oscillation stabilization time)
t
osc1
10
ms
Programmer 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 8.23 Oscillation Stabilization Time,
Boot Program Transfer Time, and Power Supply Fall Sequence
8.8.10
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.
Summary of Contents for Hitachi H8S/2191
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