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Section 6 ROM
Rev. 6.00 Sep 12, 2006 page 149 of 526
REJ09B0326-0600
Hardware Protection:
Hardware protection refers to a state in which programming/erasing of
flash memory is forcibly suspended or disabled. At this time, the flash memory control register
(FLMCR) and erase block register (EBR1 and EBR2) settings are cleared.
Details of the hardware protection states are given below.
Functions
Item Description
Program
Erase
Verify
*
1
Programming
voltage (FV
PP
)
protect
When 12 V is not being applied to the
FV
PP
pin, FLMCR, EBR1, and EBR2
are initialized, and the program/erase-
protected state is entered. To obtain
this protection, the V
PP
voltage should
not exceed the V
CC
power supply
voltage.
*
3
Disabled Disabled
*
2
Disabled
Reset/standby
protect
In a reset, (including a watchdog timer
reset), and in sleep, subsleep, watch,
and standby mode, FLMCR, EBR1,
and EBR2 are initialized, and the
program/erase-protected state is
entered. In a reset via the
RES
pin, the
reset state is not reliably entered
unless the
RES
pin is held low for at
least 20 ms (oscillation settling time)
*
4
after powering on. In the case of a
reset during operation, the
RES
pin
must be held low for a minimum of 10
system clock cycles (10
φ
).
Disabled Disabled
*
2
Disabled
Notes: 1. Three modes: program-verify, erase-verify, and prewrite-verify.
2. All blocks are erase-disabled, and individual block specification is not possible.
3. For details, see section 6.9, Flash Memory Programming and Erasing Precautions.
4. For details, see AC Characteristics in section 13, Electrical Characteristics.
6.7.9
Interrupt Handling during Flash Memory Programming/Erasing
If an interrupt is generated while the flash memory is being programmed or erased (while the P or
E bit is set in FLMCR), an operating state may be entered in which the vector will not be read
correctly in the exception handling sequence, resulting in program runaway. All interrupt sources
should therefore be masked to prevent interrupt generation while programming or erasing the flash
memory.
Содержание F-ZTAT H8/3642A Series
Страница 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Страница 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
Страница 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...