R8C/13 Group
19. Usage Notes
Table 19.2 Interrupt in EW1 Mode
Mode
Status
When maskable interrupt
request is acknowledged
When watchdog timer, oscillation stop detection and
voltage detection interrupt request area acknowledged
Once an interrupt request is acknowledged,
the auto-programming or auto-erasing is forc-
ibly stopped and resets the flash memory. An
interrupt process starts after the fixed period
and the flash memory restarts. Since the block
EW1
During auto- The auto-erasing is sus-
matic erasing pended and the interrupt pro-
(erase-sus- cess is executed. The auto-
pend function erasing can be restarted by
is enabled) setting the FMR41 bit in the
FMR4 register to “0” (erase during the auto-erasing or the address during
restart) after the interrupt the auto-programming is forcibly stopped, the
process completes
normal value may not be read. Execute the
auto-erasing again and ensure the auto-eras-
ing is competed normally. Since the watchdog
timer does not stop during the command op-
eration, the interrupt request may be gener-
ated. Reset the watchdog timer regularly using
the erase-suspend function.
During auto- The auto-erasing has a prior-
matic erasing ity and the interrupt request
(erase-sus- acknowledgement is waited.
pend func- The interrupt process is ex-
tion is dis- ecuted after the auto-erasing
abled)
Auto
completes
The auto-programming has a
programming priority and the interrupt re-
quest acknowledgement is
waited. The interrupt process
is executed after the auto-
programming completes
NOTES:
1. Do not use the address match interrupt while the command is executed because the vector of the
address match interrupt is allocated on ROM.
2. Do not use the non-maskable interrupt while Block 0 is automatically erased because the fixed bector is
allocated Block 0.
Rev.1.20 Jan 27, 2006 page 197 of 205
REJ09B0111-0120
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