Section 17 Flash Memory
Rev. 3.00 Sep. 27, 2007 Page 620 of 758
REJ09B0243-0300
Note that the reset signal should only be released after providing a reset input over a period longer
than the normal 100
µ
s. Since high voltages are applied during programming/erasing of the flash
memory, some voltage may still remain even after the error protection state has been entered. For
this reason, it is necessary to reduce the risk of damage to the flash memory by extending the reset
period so that the charge is released.
The state-transition diagram in figure 17.13 shows transitions to and from the error protection
state.
Reset or standby
(Hardware protection)
Program mode
Erase mode
Error protection mode
Error protection mode
(Software standby)
Read disabled
Programming/erasing
enabled
FLER = 0
Read enabled
Programming/erasing disabled
FLER = 0
Read enabled
Programming/erasing disabled
FLER = 1
Read disabled
Programming/erasing disabled
FLER = 1
RES
= 0
Error occurred
Error occ
urred
(Softw
are stand
by)
RES
= 0
Software standby mode
Cancel
software standby mode
RES
= 0
Programming/erasing interface
register is in its initial state.
Programming/erasing interface
register is in its initial state.
Figure 17.13 Transitions to and from Error Protection State
Содержание SH7124 R5F7124
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