H8SSLASH2224 datasheet(822/1071 Pages) RENESAS

822 / 1071 page

Section 20 Flash Memory (F-ZTAT Version)

Rev. 5.00 Aug 08, 2006 page 736 of 982

REJ09B0054-0500

1. Set RAMER to overlap part of RAM onto the area for which real-time programming is

required.

2. Emulation is performed using the overlapping RAM.

3. After the program data has been confirmed, the RAMS bit is cleared, thus releasing the RAM

overlap.

4. The data written in the overlapping RAM is written into the flash memory space.

Start of emulation program

Set RAMER

Write tuning data to overlap

RAM

Execute application program

Tuning OK?

Clear RAMER

Write to flash memory

emulation block

End of emulation program

Yes

Figure 20.9 Flowchart for Flash Memory Emulation in RAM

An example in which flash memory block area EB1 is overlapped is shown in figure 20.10.

1. The RAM area to be overlapped is fixed at a 4-kbyte area in the range H'FFD000 to H'FFDFFF

in the 384-kbyte or 256-kbyte flash memory . The RAM area to be overlapped is fixed at a 1-

kbyte area in the range H'FFD000 to H'FFD3FF in the 128-kbyte flash memory.

2. The flash memory area to be overlapped is selected by RAMER from a 4-kbyte area of the

EB0 to EB7 blocks.

3. The overlapped RAM area can be accessed from both the flash memory addresses and RAM

addresses.

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