HD64F3039F18 Datasheet, PDF(494/710 Page) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

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HD64F3039F18 Datasheet, PDF (494/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

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Section 15 ROM

15.6.2 Software Protection

Software protection can be implemented by setting the RAMS bit in RAM control register

(RAMCR) and erase block register (EBR). When software protection is in effect, setting the P or E

bit in flash memory control register (FLMCR) does not cause a transition to program mode or

erase mode. (See table 15.9.)

Table 15.9 Software Protection

Function

Item

Description

Program Erase Verify*1

Emulation

protection*2

Setting the RAMS bit in RAMCR sets the No*2

No*3

Yes

program/erase-protected state for all

blocks.

Block

specification

protection

Erase protection can be set for individual â

blocks by settings in erase block register

(EBR).*4

No

Yes

However, program protection is disabled.

Setting EBR to H'00 places all blocks in the

erase-protected state.

Notes: 1. Two modes: program-verify mode and erase-verify mode.

2. Programming to the RAM area that overlaps flash memory is possible.

3. All blocks become unerasable, and specification by block is impossible.

4. Set H'00 in the EBR bits, except for erase.

Rev.3.00 Mar. 26, 2007 Page 470 of 682

REJ09B0353-0300

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