DSPIC30F2012 datasheet(35/206 Pages) MICROCHIP

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DS70139F-page 35

dsPIC30F2011/2012/3012/3013

3.2

Data Address Space

The core has two data spaces. The data spaces can be

considered

either

separate

(for

some

DSP

instructions), or as one unified linear address range (for

MCU instructions). The data spaces are accessed

using two Address Generation Units (AGUs) and

separate data paths.

3.2.1

DATA SPACE MEMORY MAP

The data space memory is split into two blocks, X and

Y data space. A key element of this architecture is that

Y space is a subset of X space, and is fully contained

within X space. In order to provide an apparent Linear

Addressing space, X and Y spaces have contiguous

addresses.

When executing any instruction other than one of the

MAC class of instructions, the X block consists of the

64-Kbyte data address space (including all Y

addresses). When executing one of the MAC class of

instructions, the X block consists of the 64-Kbyte data

address space, excluding the Y address block (for data

reads only). In other words, all other instructions regard

the entire data memory as one composite address

space. The MAC class instructions extract the

Y address space from data space and address it using

EAs sourced from W10 and W11. The remaining X data

space is addressed using W8 and W9. Both address

spaces are concurrently accessed only with the MAC

class instructions.

The data space memory map for the dsPIC30F2011

and dsPIC30F2012 is shown in Figure 3-7. The data

space memory map for the dsPIC30F3012 and

dsPIC30F3013 is shown in Figure 3-8.

FIGURE 3-7:

dsPIC30F2011/2012 DATA SPACE MEMORY MAP

0x0000

0x07FE

0x09FE

0xFFFE

LSB

Address

16 bits

LSB

MSB

Address

0x0001

0x07FF

0x09FF

0xFFFF

0x8001

0x8000

Optionally

Mapped

into Program

Memory

0x0BFF

0x0BFE

0x0C00

0x0C01

0x0801

0x0800

0x0A01

0x0A00

Near

Data

0x1FFE

0x1FFF

2 Kbyte

SFR Space

1 Kbyte

SRAM Space

8 Kbyte

Space

X Data

Unimplemented (X)

SFR Space

X Data RAM (X)

Y Data RAM (Y)

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