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SH7052 bảng dữ liệu(PDF) 727 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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20.5.5
RAM Emulation Register (RAMER)
RAMER specifies the area of flash memory to be overlapped with part of RAM when emulating
real-time flash memory programming. RAMER is initialized to H'0000 by a power-on reset and in
hardware standby mode. It is not initialized in software standby mode. RAMER settings should be
made in user mode or user program mode.
Flash memory area divisions are shown in table 20.5. To ensure correct operation of the emulation
function, the ROM for which RAM emulation is performed should not be accessed immediately
after this register has been modified. Normal execution of an access immediately after register
modification is not guaranteed.
Bit:
15
14
13
12
11
10
9
8
——
——
———
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
2
1
0
—
—
—
—
RAMS
RAM2
RAM1
RAM0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R/W
R/W
R/W
R/W
• Bits 15 to 4—Reserved: These bits always read 0. The write value should always be 0.
• Bit 3—RAM Select (RAMS): Specifies selection or non-selection of flash memory emulation
in RAM. When RAMS = 1, all flash memory block are program/erase-protected.
Bit 3: RAMS
Description
0
Emulation not selected
(Initial value)
Program/erase-protection of all flash memory blocks is disabled
1
Emulation selected
Program/erase-protection of all flash memory blocks is enabled



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