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H8/3021 Datasheet(PDF) 507 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 507 Page - Renesas Technology Corp

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15. ROM
Rev.2.00 Mar. 22, 2007 Page 483 of 684
REJ09B0352-0200
15.8.2
Software Protection
Software protection can be implemented by setting the erase block register 1 (EBR1), erase block
register 2 (EBR2), and the RAMS bit in the RAM emulation register (RAMER). 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 15.12.)
Table 15.12 Software Protection
Functions
Item
Description
Program Erase
Verify*
1
Block
specification
protection
• Erase protection can be set for individual
blocks by settings in erase block register 1
(EBR1)*
2 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.
—
No
Yes
Emulation
protection
• Setting the RAMS bit to 1 in the RAM
emulation register (RAMER) places all
blocks in the program/erase-protected
state.
No*
3
No*
4
Yes
Notes: 1. Two modes: program-verify and erase-verify.
2. When not erasing, clear all EBR1, EBR2 bits to H'00.
3. A RAM area overlapping flash memory can be written to.
4. All blocks are unerasable and block-by-block specification is not possible.



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