HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 586

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 18 ROM (128 kB Version)
Example in Which Flash Memory Block Area (EB4) is Overlapped
1. Set bits RAMS, RAM1, and RAM0 in RAMER to 1, 0, 1, to overlap part of RAM onto the
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 (EB4).
Notes: 1. When the RAMS bit is set to 1, program/erase protection is enabled for all blocks
Rev. 5.00 Jan 06, 2006 page 566 of 818
REJ09B0273-0500
area (EB4) for which real-time programming is required.
H'000000
H'01F000
H'01F400
H'01F800
H'01FC00
H'01FFFF
2. A RAM area cannot be erased by execution of software in accordance with the erase
regardless of the value of RAM1 and RAM0 (emulation protection). In this state,
setting the P or E bit in flash memory control register 1 (FLMCR1) will not cause a
transition to program mode or erase mode. When actually programming a flash
memory area, the RAMS bit should be cleared to 0.
algorithm while flash memory emulation in RAM is being used.
Figure 18.11 Example of RAM Overlap Operation
Flash memory
EB0 to EB3
EB4
EB5
EB6
EB7
This area can be accessed
from both the RAM area
and flash memory area
On-chip RAM
H'FFFFE800
H'FFFFEBFF