h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 900

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 21B ROM (H8S/2638 Group, H8S/2639 Group, H8S/2630 Group)
Example in which Flash Memory Block Area EB0 is Overlapped
1. Set bits RAMS, RAM2 to RAM0 in RAMER to 1, 0, 0, 0, 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 (EB0).
Notes: 1. When the RAMS bit is set to 1, program/erase protection is enabled for all blocks
Rev. 6.00 Feb 22, 2005 page 840 of 1484
REJ09B0103-0600
area (EB0) for which real-time programming is required.
2. A RAM area cannot be erased by execution of software in accordance with the erase
3. Block area EB0 contains the vector table. When performing RAM emulation, the
regardless of the value of RAM2 to 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 or erasing a flash
memory area, the RAMS bit should be cleared to 0.
algorithm while flash memory emulation in RAM is being used.
vector table is needed in the overlap RAM.
H8S/2638, H8S/2639
Figure 21B-16 Example of RAM Overlap Operation
H8S/2630