D12320VF25V Datasheet, PDF (696/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.17 Flash Memory Protection
There are three kinds of flash memory program/erase protection: hardware protection, software
protection, and error protection.
17.17.1 Hardware Protection
Hardware protection refers to a state in which programming/erasing of flash memory is forcibly
disabled or aborted. Settings in flash memory control registers 1 and 2 (FLMCR1, FLMCR2) and
erase block registers 1 and 2 (EBR1, EBR2) are reset (see table 17.32).
Table 17.32 Hardware Protection
Item
Reset/standby
protection
Functions
Description
Program Erase
• In a reset (including a WDT overflow reset) Yes
Yes
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 section 20.3.3, AC
Characteristics.
Rev.7.00 Feb. 14, 2007 page 662 of 1108
REJ09B0089-0700