Virtual Flash Emulation Function - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

6.7 Virtual Flash Emulation Function

The 32170 has a special function, called the "Virtual Flash Emulation Function," which allows the

internal RAM to be mapped in blocks of 8 Kbytes from the beginning (up to four blocks for the

M32170F6, up to three blocks for the M32170F4 and M32170F3) into the internal flash memory

area divided in units of 8 Kbytes (L banks). Similarly, this function allows the internal RAM to be

mapped in blocks of 4 Kbytes, for the M32170F6 (up to two blocks) starting from the RAM address

H'0080 C000, for the M32170F4 and M32170F3 (up to two blocks) starting from the RAM address

H'0080 A000 into the internal flash memory area divided in units of 4 Kbytes (S banks).

When this function is used, the data placed in 8 Kbyte or 4 Kbyte blocks of internal RAM can be

moved to or from the L or S banks in the flash memory that are specified by the Virtual Flash Bank

dynamic modification of data using 8 Kbytes or 4 Kbytes of RAM areas. The RAM blocks allocated

for virtual flash emulation can be read or written to from both internal RAM and internal flash

memory areas. This function, when used in combination with the Real-Time Debugger (RTD),

permits you to look up or rewrite from outside the data tables created in the internal flash memory,

thus facilitating data table tuning from an external device.

Before accessing the internal flash memory for programming, be sure to terminate this virtual flash

emulation mode.

Figure 6.7.1 Internal RAM Bank Configuration of the M32170F6

RAM bank L block 0

RAM bank L block 1

RAM bank L block 2

RAM bank L block 3

RAM bank S block 0

RAM bank S block 1

6.7 Virtual Flash Emulation Function

INTERNAL MEMORY