PIC24FJ256DA206 datasheet(47/408 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS39969B-page 47

PIC24FJ256DA210 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 Genera-

tion Units (AGUs), one each for read and write opera-

tions. 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 32 Kbytes (0x0000 to 0x7FFF) of DS is com-

patible with the PIC24F microcontrollers without EDS.

The upper 32 Kbytes of data memory address space

(0x8000 - 0xFFFF) are used as an EDS window.

The EDS window is used to access all memory region

implemented in EDS, as shown in Figure 4-4.

The EDS includes any additional internal data memory

not accessible by the lower 32-Kbyte data address

space and any external memory through EPMP. For

more details on accessing internal extended data

memory, refer to the “PIC24F Family Reference

Manual”, Section 45. “Data Memory with Extended

Data Space (EDS)” (DS39733). For more details on

accessing external memory using EPMP, refer to the

“PIC24F Family Reference Manual”, Section 42.

“Enhanced

Parallel

Master

Port

(EPMP)”

(DS39730). In PIC24F microcontrollers with EDS, the

program memory can also be read from EDS. This is

called Program Space Visibility (PSV). Table 4-2 lists the

total memory accessible by each of the devices in this

family.

The EDS is organized as pages, with a single page called

an EDS page that equals the EDS window (32 Kbytes).

A particular EDS page is selected through the Data

Space Read register (DSRPAG) or Data Space Write

is used. The combination of the DSRPAG register value

and the 16-bit wide data address forms a 24-bit Effective

Address (EA). For more information on EDS, refer to

Section 4.3.3 “Reading Data from Program Memory

Using EDS”.

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” (DS39733). The

information in this data sheet supersedes

the information in the FRM.

TABLE 4-2:

TOTAL MEMORY ACCESSIBLE BY THE DEVICE

Devices

Internal RAM

External RAM Access

Using EPMP

Program Memory Access

Using EDS

PIC24FJXXXDA210

96 Kbytes (30K + 66K(1))

Yes (up to 16 MB)

Yes

PIC24FJXXXDA206

96 Kbytes (30K + 66K(1))No

Yes

PIC24FJXXXDA110

24 Kbytes

Yes (up to 16 MB)

Yes

PIC24FJXXXDA106

24 Kbytes

Yes

Note 1:

The internal RAM above 30 Kbytes can be accessed through EDS window.

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