70592C datasheet(37/314 Pages) MICROCHIP

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DS70592C-page 37

PIC24HJXXXGPX06A/X08A/X10A

FIGURE 4-4:

DATA MEMORY MAP FOR PIC24HJXXXGPX06A/X08A/X10A DEVICES WITH 16 KB RAM

4.2.5

DMA RAM

Every

PIC24HJXXXGPX06A/X08A/X10A

device

contains 2 Kbytes of dual ported DMA RAM located at

the end of data space. Memory locations in the DMA

RAM space are accessible simultaneously by the CPU

and the DMA controller module. DMA RAM is utilized by

the DMA controller to store data to be transferred to

various peripherals using DMA, as well as data

transferred from various peripherals using DMA. The

DMA RAM can be accessed by the DMA controller

without having to steal cycles from the CPU.

When the CPU and the DMA controller attempt to

concurrently write to the same DMA RAM location, the

hardware ensures that the CPU is given precedence in

accessing the DMA RAM location. Therefore, the DMA

RAM provides a reliable means of transferring DMA

data without ever having to stall the CPU.

0x0000

0x07FE

0xFFFE

LSB

Address

16 bits

LSB

MSB

Address

0x0001

0x07FF

0xFFFF

Optionally

Mapped

into Program

Memory

0x47FF

0x47FE

0x0801

0x0800

Near

Data

2 Kbyte

SFR Space

16 Kbyte

SRAM Space

8 Kbyte

Space

0x8001

0x8000

0x4800

0x4801

0x3FFE

0x4000

0x3FFF

0x4001

0x1FFE

0x1FFF

SFR Space

X Data

Unimplemented (X)

DMA RAM

X Data RAM (X)

Note:

DMA RAM can be used for general

purpose data storage if the DMA function

is not required in an application.

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