D12320VF25V Datasheet, PDF (640/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.9.2 RAM Overlap
An example in which flash memory block area EB1 is overlapped is shown below.
H'00000
EB0
H'01000
EB1
H'02000
EB2
H'03000
EB3
H'04000
EB4
H'05000
EB5
H'06000
EB6
H'07000
EB7
H'08000
This area can be accessed
from both the RAM area
and flash memory area
Flash memory
EB8 to EB11
(EB8 to EB13)^*1
(EB8 and EB9)^*2
On-chip RAM
H'3FFFF
(H'5FFFF)^*1
(H'1FFFF)^*2
Notes: 1. H'5FFFF, EB8 to EB13 in the H8S/2315 F-ZTAT.
2. H'1FFFF, EB8 and EB9 in the H8S/2317 F-ZTAT.
H'FFDC00
H'FFEBFF
H'FFFBFF
Figure 17.19 Example of RAM Overlap Operation
Example in Which Flash Memory Block Area EB1 Is Overlapped
1. Set bits RAMS, RAM2, RAM1, and RAM0 in RAMER to 1, 0, 0, 1, to overlap part of RAM
onto the area (EB1) for which real-time programming is required.
2. Real-time programming is performed using the overlapping RAM.
3. After the program data has been confirmed, the RAMS bit is cleared, releasing RAM overlap.
4. The data written in the overlapping RAM is written into the flash memory space (EB1).
Rev.7.00 Feb. 14, 2007 page 606 of 1108
REJ09B0089-0700