HD6432138SW datasheet(660/1061 Pages) RENESAS

660 / 1061 page

Section 21 ROM (Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)

Rev. 4.00 Jun 06, 2006 page 606 of 1004

REJ09B0301-0400

Table 21.9

Software Protection

Functions

Item

Description

Program

Erase

SWE bit protection

• Clearing the SWE bit to 0 in FLMCR1 sets

the program/erase-protected state for all

blocks.

(Execute in on-chip RAM or external

memory.)

Yes

Block specification

protection

• Erase protection can be set for individual

blocks by settings in erase block registers 1

and 2 (EBR1, EBR2).

• Setting EBR1 and EBR2 to H'00 places all

blocks in the erase-protected state.

—

Yes

21.8.3

Error Protection

In error protection, an error is detected when MCU runaway occurs during flash memory

programming/erasing, or operation is not performed in accordance with the program/erase

algorithm, and the program/erase operation is aborted. Aborting the program/erase operation

prevents damage to the flash memory due to overprogramming or overerasing.

If the MCU malfunctions during flash memory programming/erasing, the FLER bit is set to 1 in

FLMCR2 and the error protection state is entered. The FLMCR1, FLMCR2, EBR1, and EBR2

settings are retained, but program mode or erase mode is aborted at the point at which the error

occurred. Program mode or erase mode cannot be re-entered by re-setting the P or E bit. However,

PV and EV bit setting is enabled, and a transition can be made to verify mode.

FLER bit setting conditions are as follows:

• When flash memory is read during programming/erasing (including a vector read or instruction

fetch)

• Immediately after exception handling (excluding a reset) during programming/erasing

• When a SLEEP instruction (transition to software standby, sleep, subactive, subsleep, or watch

mode) is executed during programming/erasing

• When the bus is released during programming/erasing

Error protection is released only by a reset and in hardware standby mode.

HD6432138SW Datasheet(PDF) 660 Page - Renesas Technology Corp

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