Renesas F-ZTAT H8 Series Hardware Manual page 626

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Section 18 ROM

Example in which Flash Memory Block Area EB0 is Overlapped

1. Set bits RAMS, RAM2 to RAM0 in RAMCR to 1, 0, 0, 0, to overlap part of RAM onto the

area (EB0) 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, clear the RAMS bit to release RAM overlap.

4. Write the data written in the overlapping RAM into the flash memory space (EB0).

Notes: 1. When the RAMS bit is set to 1, program/erase protection is enabled for all blocks

regardless of the value of RAM2 to RAM0 (emulation protection). In this state, setting

the P1 or E1 bit in flash memory control register 1 (FLMCR1), or the P2 or E2 bit in

flash memory control register 2 (FLMCR2), 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.

Rev. 3.00 Mar 21, 2006 page 598 of 814

REJ09B0302-0300

Flash memory

Figure 18.16 Example of RAM Overlap Operation

This area can be accessed

from both the RAM area

and flash memory area