32174 datasheet(63/881 Pages) RENESAS

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3-2

32170/32174 Group User's Manual (Rev. 2.1)

3.1 Outline of Address Space

The M32R's logical addresses are always handled in 32 bits, providing 4 Gbytes of linear ad-

dress space. The M32R/ECU's address space consists of the following:

(1) User space

• Internal ROM area

• Extended external area

• Internal RAM area

• Special Function Register (SFR) area

(2) Boot program space

(3) System space (areas not open to the user)

(1) User space

A 2 Gbytes of address space from H'0000 0000 to H'7FFF FFFF is the user space. Located in

this space are the internal ROM area, extended external area, internal RAM area, and Spe-

cial Function Register (SFR) area, an area containing a group of internal peripheral I/O regis-

ters. Of these, the internal ROM and extended external areas are located differently depend-

ing on mode settings which will be described later.

(2) Boot program space

A 1 Gbyte of address space from H'8000 0000 to H'BFFF FFFF is the boot program space.

This space stores a program (boot program) which enables on-board programming when the

internal flash area is blank.

(3) System space

A 1 Gbyte of address space from H'C000 0000 to H'FFFF FFFF is the system space. This

space is reserved for use by development tools such as an in-circuit emulator or a debug

monitor, and cannot be used by the user.

ADDRESS SPACE

3.1 Outline of Address Space

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