SH7014 Datasheet, PDF (558/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. 128 kB Flash Memory (F-ZTAT)
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
Item
FWP pin protection
Reset/standby
protection
Functions
Description
Program Erase
• When a low level is input to the FWP pin, Yes
Yes
FLMCR1 and EBR1 are initialized, and the
program/erase-protected state is entered.
• In a reset (including a WDT overflow reset) Yes
Yes
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.
Rev.5.00 Sep. 27, 2007 Page 524 of 716
REJ09B0398-0500