H8SLASH3028F datasheet(641/923 Pages) RENESAS

641 / 923 page

Rev. 2.00, 09/03, page 611 of 890

RD VF PR ER FLER = 0

Error

occurrence

RES = 0 or STBY = 0

RES = 0 or

STBY = 0

RD VF PR ER INIT FLER = 0

Program mode

Erase mode

Reset or standby

(hardware protection)

RD VF

PR ER FLER = 1

RD VF PR ER INIT FLER = 1

Error protection mode

(software standby)

Software

standby mode

FLMCR1, EBR1, EBR2

initialization state

FLMCR1, FLMCR2,

EBR1, EBR2

initialization state

Software standby

mode release

RD: Memory read possible

VF:

Verify-read possible

PR:

Programming possible

ER:

Erasing possible

RD: Memory read not possible

VF: Verify-read not possible

PR: Programming not possible

ER: Erasing not possible

INIT: Register initialization state

RES = 0 or

STBY = 0

Error occurrence

(software standby)

Figure 18.12 Flash Memory State Transitions

(When High Level is Applied to FWE Pin in Mode 5 or 7 (On-Chip ROM Enabled))

The error protection function is invalid for abnormal operations other than the FLER bit setting

conditions. Also, if a certain time has elapsed before this protection state is entered, damage may

already have been caused to the flash memory. Consequently, this function cannot provide

complete protection against damage to flash memory.

To prevent such abnormal operations, therefore, it is necessary to ensure correct operation in

accordance with the program/erase algorithm, with the flash write enable (FWE) voltage applied,

and to conduct constant monitoring for MCU errors, internally and externally, using the watchdog

timer or other means. There may also be cases where the flash memory is in an erroneous

programming or erroneous erasing state at the point of transition to this protection mode, or where

programming or erasing is not properly carried out because of an abort. In cases such as these, a

forced recovery (program rewrite) must be executed using boot mode. However, it may also

happen that boot mode cannot be normally initiated because of overprogramming or overerasing.

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