HD64F3048VTF8 Datasheet, PDF (639/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 18 ROM (H8/3048F-ONE: Single Power Supply, H8/3048B Mask ROM Version)
18.8.2 Software Protection
Software protection can be implemented by setting, erase block register (EBR) and the RAMS bit
in the RAM control register (RAMCR). 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 18.12.)
Table 18.12 Software Protection
Functions
Item
Description
Program Erase Verify
Block
specification
protection
• Erase protection can be set for individual
—
blocks by settings in erase block register
(EBR)^*2.
However, programming protection is disabled.
No
Yes
Emulation
protection
• Setting EBR to H'00 places all blocks in the
erase-protected state.
• Setting the RAMS bit to 1 in the RAM
control register (RAMCR) places all blocks
in the program/erase-protected state.
No^*1
No^*3 Yes
Notes: 1. A RAM area overlapping flash memory can be written to.
2. When not erasing, clear all EBR bits to 0.
3. All blocks are unerasable and block-by-block specification is not possible.
Rev. 3.00 Sep 27, 2006 page 611 of 872
REJ09B0325-0300