h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 659

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

21.8
There are three kinds of flash memory program/erase protection: hardware protection, software
protection, and error protection.
21.8.1
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 21.8.)
Table 21.8 Hardware Protection
21.8.2
Software protection can be implemented by setting the SWE bit in FLMCR1 and erase block
registers 1 and 2 (EBR1, EBR2). When software protection is in effect, setting the P or E bit in
flash memory control register 1 (FLMCR1) does not cause a transition to program mode or erase
mode. (See table 21.9.)
Item
Reset/standby
protection
Section 21 ROM
Flash Memory Protection
Hardware Protection
Software Protection
Description
In a reset (including a WDT overflow reset),
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.
(Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)
Rev. 4.00 Jun 06, 2006 page 605 of 1004
Program
Yes
REJ09B0301-0400
Functions
Erase
Yes