CENTRAL PROCESSING UNIT (CPU)
2.3 Access space
2.3 Access space
The access space of the M37905 is assigned to a 16-Mbyte space from addresses 0
16
to FFFFFF
16
. (See
Figure 2.3.1.) Note that only the internal memory can be accessed because the M37905 operates only in
the single-chip mode.
The memory and I/O devices are assigned in the same access space. Accordingly, it is possible to perform
transfer and arithmetic operations using the same instructions, without discrimination of the memory from
I/O devices.
0
16
FF
16
SFR area
Internal RAM area
(Note 1)
Bank 0
16
Internal ROM area
(Note 2)
: Memory assignment of internal area
: Nothing is assigned.
Notes 1:
When the internal RAM area is followed by an unused area, do not assign a program to
the last 8 bytes of the internal RAM area.
2:
Do not assign a program to the last 8 bytes of the internal ROM area.
3:
The memory assignment of the internal area varies according to the product type.
Refer to section
“Appendix 11. Memory assignment of 7905 Group,”
or the latest datasheets, catalogs.
4:
Refer to section
“19.1.1 Memory assignment,”
about the flash memory version.
SFR : Special Function Register
Fig. 2.3.1 M37905’s access space
2-14
7905 Group User’s Manual Rev.1.0
RENESAS [ RENESAS TECHNOLOGY CORP ]
