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Rev. 1.0, 07/01, page 106 of 372
7.6.8 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 7-16 Stipulated Transition Times to Command Wait State
Item Symbol Min Max Unit Notes
Oscillation stabilization time (crystal oscillator) T
osc1
10 ms Figure 7-13
Oscillation stabilization time (ceramic oscillator) T
osc1
5 ms
Programmer mode setup time T
bmv
10 ms
Vcc hold time T
dwn
0 ms
t
osc1
t
bmv
t
dwn
Vcc
Auto-program mode
Auto-erase mode
Don't care
Figure 7-13 Oscillation Stabilization Time, Boot Program Transfer Time, and
Power-Down Sequence
7.6.9 Notes on Memory Programming
1. 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.
2. 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.