HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 852

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 19 ROM
19.17
There are three kinds of flash memory program/erase protection: hardware protection, software
protection, and error protection.
19.17.1 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 19.10).
Table 19.32 Hardware Protection
Item
FWE pin protection
Reset/standby
protection
19.17.2 Software Protection
Software protection can be implemented by setting the SWE bit in flash memory control register 1
(FLMCR1), erase block registers 1 and 2 (EBR1, EBR2), and the RAMS bit in the RAM
emulation register (RAMER). When software protection is in effect, setting the P or E bit in
FLMCR1 does not cause a transition to program mode or erase mode (see table 19.33).
Rev.6.00 Sep. 27, 2007 Page 822 of 1268
REJ09B0220-0600
Flash Memory Protection
Description
•
•
•
When a low level is input to the FWE pin,
FLMCR1, FLMCR2, EBR1, and EBR2 are
initialized, and the program/erase-protected
state is entered.
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 section 22.2.3, AC
Characteristics.
Program
Yes
Yes
Functions
Erase
Yes
Yes