SH7014 datasheet(563/754 Pages) RENESAS

563 / 754 page

18. 128 kB Flash Memory (F-ZTAT)

Rev.5.00 Sep. 27, 2007 Page 529 of 716

REJ09B0398-0500

H'000000

H'01F000

H'01F400

H'01F800

H'01FC00

H'01FFFF

Flash memory

EB0 to EB3

This area can be accessed

from both the RAM area

and flash memory area

EB7

EB6

EB5

EB4

H'FFFFF800

H'FFFFFBFF

On-chip RAM

Figure 18.17 Example of RAM Overlap Operation

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

area (EB4) 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 (EB4).

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

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.

2. A RAM area cannot be erased by execution of software in accordance with the erase

algorithm while flash memory emulation in RAM is being used.

SH7014 Datasheet(PDF) 563 Page - Renesas Technology Corp