Flash Memory Protection; 19.10.1 Hardware Protection - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Flash Memory Protection

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

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 registers 1 and 2 (FLMCR1, FLMCR2) and erase block

registers 1 and 2 (EBR1, EBR2). (See table 19-16.)

Table 19-16 Hardware Protection

FWE pin protection

Reset/standby

Rev.6.00 Oct.28.2004 page 598 of 1016

REJ09B0138-0600H

When a low level is input to the FWE pin,

FLMCR1, FLMCR2 (excluding the FLER

bit), EBR1, and EBR2 are initialized, and

the program/erase-protected state is

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.