Flash Memory Protection; Hardware Protection - Renesas Hitachi H8S/2194 Series Hardware Manual

7.6

Flash Memory Protection

There are three kinds of flash memory program/erase protection: hardware protection, software
protection, and error protection.
7.6.1

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). In error
protection mode, FLMCR1, FLMCR2, EBR1 and EBR2 settings are retained. (See table 7.7.)
Table 7.7 Hardware Protection
Item Description
• When a low level is input to the FWE pin, FLMCR1,
FWE pin
protection FLMCR2, EBR1, and EBR2 are initialized, and the
program/erase-protected state is entered
• In a reset (including a WDT overflow reset) and in
Reset/standby
protection power-down state (excluding the medium-speed
mode, module stop mode, and sleep mode),
FLMCR1, FLMCR2 (excluding the FLER bit), EBR1,
and EBR2 are initialized, and the program/erase-
protected state is entered
• In a reset via the
entered unless the
stabilizes after powering on. In the case of a reset
during operation, hold the
pulse width specified in the AC characteristics section
Rev. 2.0, 11/00, page 150 of 1037
5(6
pin, the reset state is not
5(6
pin is held low until oscillation
5(6
pin low for the
Functions
Program
Yes
Yes
5(6
Erase
Yes
Yes