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 016 to FFFFFF16. (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
SFR area
FF16
Internal RAM area
(Note 1)
Bank 016
Internal ROM area
: Memory assignment of internal area
: Nothing is assigned.
(Note 2)
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
7905 Group User’s Manual Rev.1.0
2-14
RENESAS [ RENESAS TECHNOLOGY CORP ]
