HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 855
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HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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19.19
All interrupts, including NMI input, are disabled when flash memory is being programmed or
erased (when the P or E bit is set in FLMCR1), and while the boot program is executing in boot
mode *
1. Interrupt during programming or erasing might cause a violation of the programming or
2. In the interrupt exception handling sequence during programming or erasing, the vector would
3. If an interrupt occurred during boot program execution, it would not be possible to execute the
For these reasons, in on-board programming mode alone there are conditions for disabling
interrupts, as an exception to the general rule. However, this provision does not guarantee normal
erasing and programming or MCU operation. All interrupt requests, including NMI, must
therefore be restricted inside and outside the MCU when programming or erasing flash memory.
The NMI interrupt is also disabled in the error-protection state while the P or E bit remains set in
FLMCR1.
Notes: 1. Interrupt requests must be disabled inside and outside the MCU until the programming
erasing algorithm, with the result that normal operation could not be assured.
not be read correctly *
normal boot mode sequence.
1
, to give priority to the program or erase operation. There are three reasons for this:
2. A RAM area cannot be erased by execution of software in accordance with the erase
3. Block area EB0 includes the vector table. When performing RAM emulation, the
2. The vector may not be read correctly in this case for the following two reasons:
Interrupt Handling when Programming/Erasing Flash Memory
algorithm while flash memory emulation in RAM is being used.
vector table is needed by the overlap RAM.
control program has completed programming.
• If flash memory is read while being programmed or erased (while the P or E bit is
• If the interrupt entry in the vector table has not been programmed yet, interrupt
set in FLMCR1), correct read data will not be obtained (undetermined values will
be returned).
exception handling will not be executed correctly.
2
, possibly resulting in MCU runaway.
Rev.4.00 Sep. 07, 2007 Page 825 of 1210
REJ09B0245-0400
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