H8SLASH3028F datasheet(639/923 Pages) RENESAS

639 / 923 page

Rev. 2.00, 09/03, page 609 of 890

3. All blocks are unerasable and block-by-block specification is not possible.

4. See section 4.2.2, Reset Sequence, and section 18.11, Flash Memory Programming

and Erasing Precautions. The H8/3028F-ZTAT requires a minimum of 20 system clock

cycles for a reset during operation.

18.7.2

Software Protection

Software protection can be implemented by setting the erase block register 1 (EBR1), erase block

protection, setting the P or E bit in the flash memory control register 1 (FLMCR1) does not cause

a transition to program mode or erase mode. (See table 18.9.)

Table 18.9 Software Protection

Functions

Item

Description

Program

Erase

Verify

Block

protection

• Erase protection can be set for individual

blocks by settings in erase block register 1

(EBR1) and erase block register 2

(EBR2)*

2. However, programming

protection is disabled.

• Setting EBR1 and EBR2 to H'00 places all

blocks in the erase-protected state.

—Not

possible

Possible

Emulation

protection

• Setting the RAMS bit 1 in RAMCR places

all blocks in the program/erase-protected

state.

Not

possible*

Not

possible*

Possible

Notes: 1. The RAM area overlapping flash memory can be written to.

2. When not erasing, set EBR1 and EBR2 to H'00.

3. All blocks are unerasable and block-by-block specification is not possible.

18.7.3

Error Protection

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

programming/erasing*1, 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

the flash memory status register (FLMSR2) and the error protection state is entered. FLMCR1,

FLMCR2, EBR1, and EBR2 settings*3 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-

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