Renesas R8C/18 Series Hardware Manual page 241

R8C/18 Group, R8C/19 Group
Table 19.2 EW1 Mode Interrupts
Mode Status
EW1 During auto-
erasure (erase-
suspend function
enabled)
During auto-
erasure (erase-
suspend function
disabled)
During auto-
programming
(program suspend
function enabled)
During auto-
programming
(program suspend
function disabled)
NOTES:
1. Do not use the address match interrupt while a command is executing because the vector of the
address match interrupt is allocated in ROM.
2. Do not use a non-maskable interrupt while block 0 is being automatically erased because the fixed
vector is allocated in block 0.
19.6.1.4 How to Access
Write 0 before writing 1 when setting the FMR01, FMR02, or FMR11 bit to 1. Do not generate an
interrupt between writing 0 and 1.
19.6.1.5 Rewriting User ROM Area
In EW0 Mode, if the supply voltage drops while rewriting any block in which a rewrite control program
is stored, it may not be possible to rewrite the flash memory because the rewrite control program
cannot be rewritten correctly. In this case, use standard serial I/O mode.
19.6.1.6 Program
Do not write additions to the already programmed address.
19.6.1.7 Entering Stop Mode or Wait Mode
Do not enter stop mode or wait mode during erase-suspend.
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
When Maskable Interrupt Request is
Acknowledged
Auto-erasure is suspended after
td(SR-ES) and interrupt handing is
executed. Auto-erasure can be
restarted by setting the FMR41 bit in
the FMR4 register to 0 (erase restart)
after interrupt handing completes.
Auto-erasure has priority and the
interrupt request acknowledgement
is put on standby. Interrupt handing
is executed after auto-erasure
completes.
Auto-programming is suspended
after td(SR-SUS) and interrupt
handing is executed.
Auto-programming can be restarted
by setting the FMR42 bit in the FMR4
register to 0 (program restart) after
interrupt handing completes.
Auto-programming has priority and
the interrupt request
acknowledgement is put on standby.
Interrupt handing is executed after
auto-programming completes.
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When Watchdog Timer, Oscillation
Stop Detection and Voltage Monitor 2
Interrupt Request are Acknowledged
Once an interrupt request is
acknowledged, auto-programming or
auto-erasure is forcibly stopped
immediately and the flash memory is
reset. Interrupt handing starts after the
fixed period and the flash memory
restarts. Since the block during auto-
erasure or the address during auto-
programming is forcibly stopped, the
normal value may not be read. Execute
auto-erasure again and ensure it
completes normally.
Since the watchdog timer does not
stop during the command operation,
interrupt requests may be generated.
Reset the watchdog timer regularly
using the erase-suspend function.
19. Usage Notes