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MITSUBISHI MICROCOMPUTERS
M37905F8CFP, M37905F8CSP
16-BIT CMOS MICROCOMPUTER
FLASH MEMORY MODE
These microcomputers contain the flash memory; and single-power-
supply reprogramming is available to this. These microcomputers
have the following three modes, enabling reading/programming/era-
sure for the flash memory:
• Flash memory parallel I/O mode and Flash memory serial I/O
mode, where the flash memory is handled by using an external pro-
grammer.
• CPU reprogramming mode, where the flash memory is handled by
the central processing unit (CPU).
As shown in Figure 4, the flash memory is divided into several
blocks, and erasure per block is possible.
This internal flash memory has the boot ROM area storing the repro-
gramming control software for reprogramming in the CPU repro-
gramming mode and flash memory serial I/O mode, as well as the
user ROM area storing a certain control software for the normal op-
eration in the microcomputer mode.
Although our reprogramming control firmware for the flash memory
serial I/O mode has been stored into this boot ROM area on ship-
ment, the user-original reprogramming control software which is
more appropriate for the user’s system is reprogrammable into this
area, instead. Note that the reprogramming for the boot ROM area is
enabled only in the flash memory parallel I/O mode.
001000
16
001000
16
28 Kbytes
007FFF
16
008000
16
00FFFF
16
00BFFF
16
00C000
16
16 Kbytes
8 Kbytes
00DFFF
16
00E000
16
00FFFF
16
8 Kbytes
Fig. 4 M37905F8CFP, M37905F8CSP: block configuration of internal flash memory
12
RENESAS [ RENESAS TECHNOLOGY CORP ]
