HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 918
HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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Section 19 ROM
19.27.2 RAM Overlap
An example in which flash memory block area EB1 is overlapped is shown below.
Example in which Flash Memory Block Area EB1 is Overlapped
1. Set bits RAMS, RAM2, RAM1, and RAM0 in RAMER to 1, 0, 0, 1, to overlap part of RAM
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 (EB1).
Notes: 1. When the RAMS bit is set to 1, program/erase protection is enabled for all blocks
Rev.6.00 Sep. 27, 2007 Page 888 of 1268
REJ09B0220-0600
onto the area (EB1) for which real-time programming is required.
H'000000
H'001000
H'002000
H'030000
H'004000
H'005000
H'006000
H'007000
H'008000
H'07FFFF
regardless of the value of RAM2, RAM1, and RAM0 (emulation protection). In this
state, setting the P1 or E1 bit in flash memory control register 1 (FLMCR1), or setting
Figure 19.75 Example of RAM Overlap Operation
Flash memory
EB8 to EB15
EB0
EB1
EB2
EB3
EB4
EB5
EB6
EB7
This area can be accessed
from both the RAM area
and flash memory area
On-chip RAM
H'FFDC00
H'FFEBFF
H'FFFBFF
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