7906 datasheet(35/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

2-14

CENTRAL PROCESSING UNIT (CPU)

2.3 Access space

The access space of the M37906 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 M37906 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.

Fig. 2.3.1 M37906’s access space

: Nothing is assigned.

016

SFR area

Internal RAM area

(Note 1)

Bank 016

Internal ROM area

(Note 2)

FF16

SFR : Special Function Register

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 7906 Group,” or the latest datasheets, catalogs.

4: Refer to section “19.1.1 Memory assignment,” about the flash memory version.

: Memory assignment of internal area

2.3 Access space

7906 Datasheet(PDF) 35 Page - Renesas Technology Corp