PIC24FJ128GA310 datasheet(43/406 Pages) MICROCHIP

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DS39996F-page 43

PIC24FJ128GA310 FAMILY

4.2

Data Memory Space

The PIC24F core has a 16-bit wide data memory space,

addressable as a single linear range. The data space is

accessed using two Address Generation Units (AGUs),

one each for read and write operations. The data space

memory map is shown in Figure 4-3.

The 16-bit wide data addresses in the data memory

space point to bytes within the Data Space (DS). This

gives a DS address range of 64 Kbytes or 32K words.

The lower half (0000h to 7FFFh) is used for

implemented (on-chip) memory addresses.

The upper half of data memory address space (8000h to

FFFFh) is used as a window into the Extended Data

Space (EDS). This allows the microcontroller to directly

access a greater range of data beyond the standard

16-bit address range. EDS is discussed in detail in

Section 4.2.5 “Extended Data Space (EDS)”

The lower half of DS is compatible with previous PIC24F

microcontrollers without EDS. All PIC24FJ128GA310

family devices implement 8 Kbytes of data RAM in the

lower half of DS, from 0800h to 27FFh.

4.2.1

DATA SPACE WIDTH

The

data

memory

space

organized

byte-addressable, 16-bit wide blocks. Data is aligned

in data memory and registers as 16-bit words, but all

data space EAs resolve to bytes. The Least Significant

Bytes (LSBs) of each word have even addresses, while

the Most Significant Bytes (MSBs) have odd

addresses.

FIGURE 4-3:

DATA SPACE MEMORY MAP FOR PIC24FJ128GA310 FAMILY DEVICES

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

“PIC24F

Family

Reference

Manual

”,

Section

45.

“Data

Memory

with

Extended Data Space (EDS)

” (DS39733).

The information in this data sheet

supersedes the information in the FRM.

Note:

Memory areas not shown to scale.

0000h

07FEh

FFFEh

LSB

Address

LSB

MSB

Address

0001h

07FFh

1FFFh

FFFFh

8001h

8000h

7FFFh

0801h

0800h

2001h

Near

1FFEh

SFR

2000h

7FFEh

EDS Window

Space

Data Space

Upper 32 Kbytes

Data Space

2800h

2801h(1)

Lower 32 Kbytes

Data Space

8 Kbytes Data RAM

SFR Space

Unimplemented

EDS Page 0x1

(32 Kbytes)

EDS Page 0x2

(32 Kbytes)

EDS Page 0x3 (2 Kbytes)

EDS Page 0x4

EDS Page 0x1FF

EDS Page 0x200

EDS Page 0x2FF

EDS Page 0x300

EDS Page 0x3FF

Internal Extended

Data RAM (66 Kbytes)

EPMP Memory Space

Program Space Visibility

Area to Access Lower

Word of Program Memory

Program Space Visibility

Area to Access Upper

Word of Program Memory

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