MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
MEMORY MODIFICATION FUNCTION
When ordering a mask ROM, Mitsubishi Electric corp. produces the
The M37754M8C-XXXGP’s internal memory size and address area
can be modified by set of bit 2 (memory allocation select bit) of the
particular function select register 0. Figure 90 shows the memory al-
location when modifying the internal memory area.
mask ROM using the data within 60 Kbytes (between addresses
00100016 to 00FFFF16). It is regardless of the selected ROM size
(refer to MASK ROM ORDER CONFIRMATION FORM). Therefore,
on the EPROM tendered for ordering a mask ROM, program data
“FF16” to addresses which correspond to the area out of the selected
ROM area.
Additionally, address 00FFFF16 of the microcomputer corresponds
to the lowest address of the tendered EPROM.
Memory allocation select bit = “1”
ROM size : 56 Kbytes
Memory allocation select bit = “0”
ROM size : 60 Kbytes
RAM size : 2048 bytes
RAM size : 2048 bytes
00 000016
00 008016
00 087F16
00 000016
00 008016
00 087F16
SFR
SFR
Internal RAM 2048 bytes
Internal RAM 2048 bytes
00 100016
00 200016
00 FFFF16
Internal ROM
60 Kbytes
Internal ROM
56 Kbytes
00 FFFF16
External memory area
External memory area
Note : The internal ROM area becomes external memory area
in microprocessor mode.
FF FFFF16
FF FFFF16
Fig. 90 Memory allocation when modifying internal memory area with memory allocation select bit
78
RENESAS [ RENESAS TECHNOLOGY CORP ]
