Rev.6.00 Oct.28.2004 page 644
of 1016
REJ09B0138-0600H
19.19.3
Error Protection
In error protection, an error is detected when MCU runaway occurs during flash memory programming/erasing, or
operation is not performed in accordance with the program/erase algorithm, and the program/erase operation is aborted.
Aborting the program/erase operation prevents damage to the flash memory due to overprogramming or overerasing.
If the MCU malfunctions during flash memory programming/erasing, the FLER bit is set to 1 in FLMCR2 and the error
protection state is entered. The FLMCR1, FLMCR2, EBR1, and EBR2 settings are retained, but program mode or erase
mode is aborted at the point at which the error occurred. Program mode or erase mode cannot be re-entered by re-setting
the P or E bit. However, PV and EV bit setting is enabled, and a transition can be made to verify mode.
FLER bit setting conditions are as follows:
•
When flash memory is read during programming/erasing (including a vector read or instruction fetch)
•
Immediately after exception handling (excluding a reset) during programming/erasing
•
When a SLEEP instruction (including software standby) is executed during programming/erasing
•
When the CPU loses the bus during programming/erasing
Error protection is released only by a reset and in hardware standby mode.
Figure 19-50 shows the flash memory state transition diagram.
RD VF PR ER
FLER = 0
Error
occurrence
RES
= 0 or
STBY
= 0
RES
= 0 or
STBY
= 0
RD
VF
PR
ER
FLER = 0
Normal operating mode
Program mode
Erase mode
Reset or hardware standby
(hardware protection)
RD VF
PR
ER
FLER = 1
RD
VF
PR
ER
FLER = 1
Error protection mode
Error protection mode
(software standby)
Software
standby mode
FLMCR1, FLMCR2 (except FLER
bit), EBR1, EBR2 initialization state
FLMCR1, FLMCR2,
EBR1, EBR2
initialization state
Software standby
mode release
RD: Memory read possible
VF: Verify-read possible
PR: Programming possible
ER: Erasing possible
RD
: Memory read not possible
VF
: Verify-read not possible
PR
: Programming not possible
ER
: Erasing not possible
Legend:
RES
= 0 or
STBY
= 0
Error occurrence
(software standby)
Figure 19-50 Flash Memory State Transitions
Содержание ZTAT H8S/2357F
Страница 4: ......
Страница 28: ...Rev 6 00 Oct 28 2004 page xxiv of xxiv REJ09B0138 0600H...
Страница 82: ...Rev 6 00 Oct 28 2004 page 54 of 1016 REJ09B0138 0600H...
Страница 108: ...Rev 6 00 Oct 28 2004 page 80 of 1016 REJ09B0138 0600H...
Страница 364: ...Rev 6 00 Oct 28 2004 page 336 of 1016 REJ09B0138 0600H...
Страница 438: ...Rev 6 00 Oct 28 2004 page 410 of 1016 REJ09B0138 0600H...
Страница 566: ...Rev 6 00 Oct 28 2004 page 538 of 1016 REJ09B0138 0600H...
Страница 588: ...Rev 6 00 Oct 28 2004 page 560 of 1016 REJ09B0138 0600H...
Страница 688: ...Rev 6 00 Oct 28 2004 page 660 of 1016 REJ09B0138 0600H...
Страница 694: ...Rev 6 00 Oct 28 2004 page 666 of 1016 REJ09B0138 0600H...
Страница 708: ...Rev 6 00 Oct 28 2004 page 680 of 1016 REJ09B0138 0600H...
Страница 1044: ...Rev 6 00 Oct 28 2004 page 1016 of 1016 REJ09B0138 0600H...
Страница 1047: ...H8S 2357 Group H8S 2357F ZTATTM H8S 2398F ZTATTM Hardware Manual 2 6 2 Ote machi Chiyoda ku Tokyo 100 0004 Japan...