SH7018 datasheet(369/431 Pages) RENESAS

369 / 431 page

353

16.8

Protection

There are two kinds of flash memory program/erase protection, hardware protection and software

protection.

16.8.1

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), erase block register 1 (EBR1), and erase block register 2 (EBR2). The FLMCR1,

EBR1, and EBR2 settings are retained in the error-protected state. (See table 16.8.)

Table 16.8

Hardware Protection

Functions

Item

Description

Program

Erase

FWP pin protection

• When a high level is input to the FWP pin,

FLMCR1, EBR1, and EBR2 are initialized,

and the program/erase-protected state is

entered.

Yes

Reset/standby

protection

• In a reset (including a WDT overflow reset)

and in standby mode, FLMCR1, EBR1,

and EBR2 are initialized, and the

program/erase-protected state is entered.

• In a power-on 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

SH7018 Datasheet(PDF) 369 Page - Renesas Technology Corp