D301 datasheet(45/416 Pages) MICROCHIP

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DS30010118D-page 45

PIC24FJ256GA705 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 4-2.

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 16 Kbytes or 8K 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)”.

4.2.1

DATA SPACE WIDTH

The data memory space is organized in 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 4-2:

DATA SPACE MEMORY MAP FOR PIC24FJ256GA705 DEVICES

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive refer-

ence source. For more information, refer

to the “dsPIC33/PIC24 Family Reference

Manual”, “Data Memory with Extended

Data Space (EDS)” (DS39733). The infor-

mation in this data sheet supersedes the

information in the FRM.

Note: Memory areas are 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

Lower 32 Kbytes

Data Space

16 Kbytes Data RAM

SFR Space

47FFh

4801h

47FEh

4800h

Unimplemented

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