7751 datasheet(36/540 Pages) RENESAS

36 / 540 page

CENTRAL PROCESSING UNIT (CPU)

7751 Group User’s Manual

2–17

2.3 Access space

Figure 2.3.1 shows the M37751’s access space.

By combination of the program counter (PC), which is 16 bits of structure, and the program bank register

(PG), a 16-Mbyte space from addresses 016 to FFFFFF16 can be accessed. For details about access of an

external area, refer to “Chapter 12. CONNECTION WITH EXTERNAL DEVICES.”

The memory and I/O devices are allocated 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 M37751’s access space

: Indicates the memory assignment of

the internal areas.

: Indicates that nothing is assigned.

Note : Memory assignment of internal area varies according to the type of microcomputer. This

figure shows the case of the M37751M6C-XXXFP.

Refer to “Appendix 1. Memory assignment” for other products.

SFR : Special Function Register

00000016

00008016

00FFFF16

01000016

FE000016

FF000016

FFFFFF16

SFR area

Internal RAM area

Bank 016

Internal ROM area

02000016

00087F16

00007F16

Bank 116

Bank FF16

Bank FE16

00400016

7751 Datasheet(PDF) 36 Page - Renesas Technology Corp