H8SSLASH2214 datasheet(636/936 Pages) RENESAS

636 / 936 page

Section 15 ROM

Rev.4.00 Sep. 18, 2008 Page 576 of 872

REJ09B0189-0400

15.10

Protection

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

protection, and error protection.

15.10.1

Hardware Protection

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

disabled or aborted. Hardware protection is reset by settings in flash memory control register 1

(FLMCR1), flash memory control register 2 (FLMCR2), erase block register 1 (EBR1), and erase

block register 2 (EBR2). The FLMCR1, FLMCR2, EBR1, and EBR2 settings are retained in the

error-protected state. (See table 15.10)

Table 15.10 Hardware Protection

Functions

Item

Description

Program

Erase

FWE pin protection

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

FLMCR1, FLMCR2, (except bit FLER)

EBR1, and EBR2 are initialized, and the

program/erase-protected state is entered.

Yes

Reset/standby

protection

• In a power-on reset (including a WDT

power-on 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.

Yes

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