DSPIC33FJ64GS406 datasheet(46/456 Pages) MICROCHIP

46 / 456 page

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

DS70591E-page 46

 2009-2012 Microchip Technology Inc.

4.1.1

PROGRAM MEMORY

ORGANIZATION

The program memory space is organized in

word-addressable blocks. Although it is treated as

24 bits wide, it is more appropriate to think of each

address of the program memory as a lower and upper

word, with the upper byte of the upper word being

unimplemented. The lower word always has an even

address, while the upper word has an odd address (see

Figure 4-2).

Program memory addresses are always word-aligned

on the lower word, and addresses are incremented or

decremented by two during the code execution. This

arrangement provides compatibility with data memory

space addressing and makes data in the program

memory space accessible.

4.1.2

INTERRUPT AND TRAP VECTORS

All

dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610 devices reserve the

addresses between 0x00000 and 0x000200 for

hard-coded program execution vectors. A hardware

Reset vector is provided to redirect code execution from

the default value of the PC on device Reset to the actual

start of code. A GOTO instruction is programmed by the

user application at 0x000000, with the actual address for

the start of code at 0x000002.

The

dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610 devices also have

two Interrupt Vector Tables (IVT), located from

0x000004 to 0x0000FF and 0x000100 to 0x0001FF.

These vector tables allow each of the device interrupt

sources to be handled by separate Interrupt Service

Routines (ISRs). A more detailed discussion of the

Interrupt Vector Tables is provided in Section 7.1

“Interrupt Vector Table”.

FIGURE 4-2:

PROGRAM MEMORY ORGANIZATION

PC Address

0x000000

0x000002

0x000004

0x000006

00000000

Program Memory

‘Phantom’ Byte

(read as ‘0’)

least significant word

most significant word

Instruction Width

0x000001

0x000003

0x000005

0x000007

msw

Address

(lsw Address)

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