3069RF-ZTAT Datasheet, PDF (653/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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 18.16 shows transitions to and from the error-protection
state.
Program mode
Erase mode
Read disabled
Programming/erasing
enabled FLER=0
Error occurrence
4-5 = 0 or 56*; = 0
Err_{(oSroofctwcuarrreenscteand4b-y)55=60*o;r =0}
Error protection mode ^{Software-standby mode}
Reset or standby
(Hardware protection)
Read disabled
Programming/erasing disabled
FLER=0
4-5=0 or
56*;=0
Program/erase interface
register is in its initial state.
Error-protection mode
(Software standby)
Read enabled
Programming/erasing disabled
FLER=1
Cancel
software-standby
mode
Read disabled
programming/erasing disabled
FLER=1
Program/erase interface
register is in its initial state.
Figure 18.16 Transitions to and from the Error-Protection State
Rev. 5.0, 09/04, page 631 of 978