DSPIC30F datasheet(37/248 Pages) MICROCHIP

37 / 248 page

 2004 Microchip Technology Inc.

Preliminary

DS70083G-page 35

dsPIC30F

3.0

MEMORY ORGANIZATION

3.1

Program Address Space

The program address space is 4M instruction words. It

is addressable by a 24-bit value from either the 23-bit

PC, table instruction EA, or data space EA, when pro-

gram space is mapped into data space as defined by

Table 3-1. Note that the program space address is

incremented by two between successive program

words in order to provide compatibility with data space

addressing.

User program space access is restricted to the lower

4M instruction word address range (0x000000 to

0x7FFFFE

) for all accesses other than TBLRD/TBLWT,

which use TBLPAG<7> to determine user or configura-

tion space access. In Table 3-1, Program Space

Address Construction, bit 23 allows access to the

Device ID, the User ID and the configuration bits.

Otherwise, bit 23 is always clear.

TABLE 3-1:

PROGRAM SPACE ADDRESS CONSTRUCTION

FIGURE 3-1:

DATA ACCESS FROM PROGRAM SPACE ADDRESS GENERATION

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the dsPIC30F Family Reference

Manual (DS70046). For more information on the device

instruction set and programming, refer to the dsPIC30F

Programmer’s Reference Manual (DS70030).

Note:

The address map shown in Figure 3-5 is

conceptual, and the actual memory con-

figuration may vary across individual

devices depending on available memory.

Access Type

Access

Space

Program Space Address

<23>

<22:16>

<15>

<14:1>

<0>

Instruction Access

User

PC<22:1>

TBLRD/TBLWT

User

(TBLPAG<7> = 0)

TBLPAG<7:0>

Data EA<15:0>

TBLRD/TBLWT

Configuration

(TBLPAG<7> = 1)

TBLPAG<7:0>

Data EA<15:0>

Program Space Visibility

User

PSVPAG<7:0>

Data EA<14:0>

Program Counter

23 bits

PSVPAG Reg

8 bits

15 bits

Program

Using

Select

TBLPAG Reg

8 bits

16 bits

Using

Byte

24-bit EA

1/0

Select

User/

Configuration

Table

Instruction

Program

Space

Counter

Using

Space

Select

Visibility

Note:

Program space visibility cannot be used to access bits <23:16> of a word in program memory.

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