HD64F2149YV datasheet(744/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Section 22 ROM

Rev. 3.00 Jan 18, 2006 page 716 of 1044

REJ09B0280-0300

22.8

Flash Memory Protection

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

protection, and error protection.

22.8.1

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 registers 1

and 2 (FLMCR1, FLMCR2) and erase block registers 1 and 2 (EBR1, EBR2). (See table 22.9.)

Table 22.9

Hardware Protection

Functions

Item

Description

Program

Erase

Reset/standby

protection

• In a reset (including a WDT overflow

reset) and in hardware standby mode,

software standby mode, subactive mode,

subsleep mode, and watch 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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