SH7052 datasheet(793/919 Pages) RENESAS

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21.8

Protection

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

protection.

21.8.1

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, and

EBR1 settings are retained in the error-protected state. (See table 21.10.)

Table 21.10 Hardware Protection

Functions

Item

Description

Program

Erase

FWE pin protection

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

FLMCR1, FLMCR2, 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. Do not execute a

reset during programming or erasing, as

the values in the flash memory are not

guaranteed if this is done. In this case,

execute an erase, then execute

programming once again.

Yes

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