Renesas H8S/2319 series Hardware Manual page 746

Error protection is cancelled only by a power-on reset or by hardware-standby mode. Note that the
reset should only be released after providing a reset input over a period longer than the normal 100
µs period. Since high voltages are applied during programming/erasing of the flash memory, some
voltage may remain 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 17-75 shows transitions to and from the error-protection
state.
Program mode
Erase mode
Read disabled
Programming/erasing
enabled FLER=0
Error occurrence
Error protection mode
Read enabled
Programming/erasing disabled
FLER=1
Figure 17-75 Transitions to and from the Error-Protection State
Rev. 5.00, 12/03, page 716 of 1088
RES = 0 or HSTBY = 0
Software-standby mode
Cancel
software-standby mode
Reset or standby
(Hardware protection)
Read disabled
Programming/erasing disabled
FLER=0
Program/erase interface
RES=0 or register is in its initial state.
HSTBY=0
Error-protection mode
(Software standby)
Read disabled
programming/erasing disabled
FLER=1
Program/erase interface
register is in its initial state.