SH7014 datasheet(558/754 Pages) RENESAS

558 / 754 page

18. 128 kB Flash Memory (F-ZTAT)

Rev.5.00 Sep. 27, 2007 Page 524 of 716

REJ09B0398-0500

18.8

Protection

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

protection.

18.8.1

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) and erase block register 1 (EBR1). The FLMCR1 and EBR1 settings are retained in

the error-protected state. (See table 18.8.)

Table 18.8

Hardware Protection

Functions

Item

Description

Program

Erase

FWP pin protection

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

FLMCR1 and EBR1 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 and EBR1

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

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