PIC24FJ256DA206 datasheet(71/408 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS39969B-page 71

PIC24FJ256DA210 FAMILY

4.2.5

EXTENDED DATA SPACE (EDS)

The

enhancement

the

data

space

PIC24FJ256DA210

family

devices

has

been

accomplished by a new technique, called the Extended

Data Space (EDS).

The EDS includes any additional internal extended

data memory not accessible by the lower 32 Kbytes

data address space, any external memory through

EPMP and the Program Space Visibility (PSV).

The extended data space is always accessed through

the EDS window, the upper half of data space. The

entire extended data space is organized into EDS

pages, each having 32 Kbytes of data. Mapping of the

EDS page into the EDS window is done using the Data

Space Read register (DSRPAG<9:0>) for read opera-

tions and Data Space Write register (DSWPAG<8:0>)

for write operations. Figure 4-4 displays the entire EDS

space.

FIGURE 4-4:

EXTENDED DATA SPACE

Note:

Accessing Page 0 in the EDS window will

generate an address error trap as Page 0

is the base data memory (data locations,

0x0800 to 0x7FFF, in the lower data

space).

0x0000

Extended SRAM(1) (66 KB)

Special

Registers

30 KB Data

32 KB EDS

Window

Memory

0x8000

Program Memory

DSxPAG

= 0x001

DSxPAG

= 0x003

DSx PAG

= 0x1FF

DSRPAG

= 0x200

DSRPAG

= 0x3FF

Function

0x008000

0x00FFFE

0x000000

0x7F8001

0xFFFFFE

0x007FFE

0x7FFFFF

Internal

Program

Space

0x0800

0xFFFE

EDS Space

EPMP Memory Space(2)

0x018000

0x0187FE

Extended

Memory(1)

Internal

Extended

Memory(1)

External

Memory

Access

using

EPMP(2)

External

Memory

Access

using

EPMP(2)

0xFF8000

DSRPAG

= 0x2FF

0x7F8000

0x7FFFFE

Access

Program

Space

Access

Program

Space

Access

DSRPAG

= 0x300

0x000001

0x007FFF

Program

Space

Access

0x01FFFE

0x018800

Note

Available only in PIC24FJXXXDA2XX devices. In the PIC24FJXXXDA110 devices, this space can be used to access external

memory using EPMP.

Available only in PIC24FJXXXDAX10 devices (100-pin).

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