32172 datasheet(68/875 Pages) RENESAS

68 / 875 page

3-9

Rev.1.0

ADDRESS SPACE

3.4 Internal RAM and SFR Areas

The 8-Mbyte area in user space addresses from H'0080 0000 to H'00FF FFFF is used for the

internal RAM area and the SFR (Special Function Register) area. Of these, the space that the user

can actually use is a 128-Kbyte area from H'0080 0000 to H'0081 FFFF, and the other addresses

comprise ghost areas in units of 128 Kbytes. (When programming, do not use the ghost area

unless absolutely necessary.)

3.4.1 Internal RAM Area

For the M32172F2, the internal RAM is allocated to addresses H'0080 4000 through H'0080 7FFF

(16 Kbytes). For the M32173F2, the internal RAM is allocated to addresses H'0080 4000 through

H'0080 BFFF (32 Kbytes).

3.4.2 SFR (Special Function Register) Area

Addresses H'0080 0000 to H'0080 3FFF are the SFR (Special Function Register) area. Located in

this area are the internal peripheral I/O registers.

Figure 3.4.1 Internal RAM Area and SFR (Special Function Register) Area of the M32172F2

H'0080 0000

SFR area

(16 Kbytes)

Internal RAM

(16 Kbytes)

H'0080 3FFF

H'0080 4000

H'0080 7FFF

Virtual-flash emulation area

separated in units of 8 Kbytes

can be mapped into this area.

For details, see Section 6.7.

32172 Datasheet(PDF) 68 Page - Renesas Technology Corp