R8C datasheet(182/199 Pages) RENESAS

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R8C/10 Group

19. Usage Notes

Rev.1.20 Jan 27, 2006

page 172 of 180

REJ09B0019-0120

Mode

EW1

Status

During auto-

matic erasing

(erase-sus-

pend func-

tion is en-

abled)

When maskable interrupt

request is acknowledged

The auto-erasing is sus-

pended and the interrupt pro-

cess is executed. The auto-

erasing can be restarted by

setting the FMR41 bit in the

FMR4 register to “0” (erase

restart) after the interrupt

process completes

The auto-erasing has a prior-

ity and the interrupt request

acknowledgement is waited.

The interrupt process is ex-

ecuted after the auto-erasing

completes

The auto-programming has a

priority and the interrupt re-

quest acknowledgement is

waited. The interrupt process

is executed after the auto-

programming completes

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

during the auto-erasing or the address during

the auto-programming is forcibly stopped, the

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.

Table 19.2 Interrupt in EW1 Mode

During auto-

matic erasing

(erase-sus-

pend func-

tion is dis-

abled)

Auto

pro-

gramming

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.

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