SH7052 datasheet(777/919 Pages) RENESAS

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21.5.5

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 21.5. 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:

——

———

—

Initial value:

R/W:

Bit:

—

RAMS

RAM2

RAM1

RAM0

Initial value:

R/W:

R/W

• Bits 15 to 4—Reserved: These bits always read 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

Emulation not selected

(Initial value)

Program/erase-protection of all flash memory blocks is disabled

Emulation selected

Program/erase-protection of all flash memory blocks is enabled

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