H8SLASH3028F datasheet(638/923 Pages) RENESAS

638 / 923 page

Rev. 2.00, 09/03, page 608 of 890

18.7

Flash Memory Protection

There are three kinds of flash memory program/erase protection: hardware, software, and error

protection.

18.7.1

Hardware Protection

Hardware protection refers to a state in which programming/erasing of flash memory is forcibly

disabled or aborted. In this state, the settings in flash memory control register 1 (FLMCR1) and

erase block registers 1 and 2 (EBR1, EBR2) are reset. In the error protection state, the FLMCR1,

EBR1, and EBR2 settings are retained; the P bit and E bit can be set, but a transition is not made

to program mode or erase mode. (See table 18.8.)

Table 18.8 Hardware Protection

Function

Item

Description

Program Erase

Verify

FWE pin

protection

• When a low level is input to the FWE pin,

FLMCR1, EBR1, and EBR2 are initialized, and

the program/erase-protected state is entered.

Not

possible*

Not

possible*

Not

possible

Reset/

standby

protection

• In a reset (including a WDT overflow reset)

and in standby mode, FLMCR1, FLMCR2,

EBR1, and EBR2 are initialized, and the

program/erase-protected state is entered.

• In a reset via the RES pin, the reset state is not

entered unless the

RES pin is held low until

oscillation stabilizes after powering on. In the

case of a reset during operation, hold the

RES

pin low for the

RES pulse width specified in the

AC Characteristics section.*

Not

possible

Not

possible*

Not

possible

Error

protection

• When a microcomputer operation error (error

generation (FLER = 1)) was detected while flash

memory was being programmed/erased, error

protection is enabled. At this time, the FLMCR1,

EBR1, and EBR2 settings are held, but

programming/erasing is aborted at the time the

error was generated. Error protection is released

only by a reset via the

RES pin or a WDT reset,

or in the hardware standby mode.

Not

possible

Not

possible*

Possible*

Notes: 1. The RAM area that overlapped flash memory is deleted.

2. It is possible to perform a program-verify operation on the 128 bytes being

programmed, or an erase-verify operation on the block being erased.

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