Microchip PIC24F08KM102 Handleiding

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PIC24F Flash Program Memory

HIGHLIGHTS

This section of the manual contains the following major topics:

1.0 Introduction ....................................................................................................................... 2

2.0 Program Memory Architecture .......................................................................................... 2

3.0 Table Operation Instructions ............................................................................................. 8

4.0 Flash Memory Programming........................................................................................... 13

5.0 Program Space Visibility and Extended Data Space (PSV and EDS)............................. 21

6.0 Error Correcting Code (ECC) .......................................................................................... 21

7.0 Low-Power Operation ..................................................................................................... 21

8.0 Register Map................................................................................................................... 22

9.0 Related Application Notes............................................................................................... 23

10.0 Revision History .............................................................................................................. 24

dsPIC33/PIC24 Family Reference Manual

1.0 INTRODUCTION

All PIC24F devices have an internal programmable Flash array for the execution of user code.

The high-endurance Flash array provides great flexibility in code development and storage,

combining a long retention life with a high number of read/write cycles.

2.0 PROGRAM MEMORY ARCHITECTURE

PIC24F devices address a 4M x 24-bit program memory address space, as shown in Figure 2-1.

The program memory map is equally divided into the user memory space (000000h to 7FFFFFh)

and the configuration (or test) memory space (800000h to FFFFFFh).

The user program space contains the Reset vector, Interrupt Vector Tables (IVTs) and program

memory. There are three methods for accessing program space:

1. The 23-bit Program Counter (PC).

2. Table Read (TBLRD) and Table Write (TBLWT) instructions.

3. By mapping any 32-Kbyte segment of program memory into the data memory

address space.

Implemented program memory can be further divided into the vector area, which includes the

Reset and interrupt vectors, and the code area, which also includes the Flash configuration data.

Accessing unimplemented areas of the user program space (i.e., above the upper implemented

boundary of program memory) will cause an illegal address trap.

Note: This family reference manual section is meant to serve as a complement to device

data sheets. Depending on the device variant, this manual section may not apply to

all PIC24F devices.

Please consult the note at the beginning of the “Flash Program Memory” chapter

in the current device data sheet to check whether this document supports the

device you are using.

Device data sheets and family reference manual sections are available for

download from the Microchip Worldwide Web site at: http://www.microchip.com

PIC24F Flash Program Memory

Figure 2-1: Default Program Space Memory Map for PIC24F Devices

000000h

FEFFFEh

FFFFFFh

00xx00h(1)

00xxFEh(1)

Configuration Memory Space User Memory Space

Legend: Memory areas are not shown to scale.

Note 1: The vector area extends to 0000FEh in devices with original IVT mapping. See text and Figure 2-2 for the lower

boundary of the vector area in devices with newer IVT mapping.

2: Exact boundary addresses are determined by the size of the implemented program memory and number of

Configuration registers.

3: Devices with J-Flash program memory only. See Section 2.3 “Flash Configuration Data (PIC24FJ Devices

Only)” for more information.

4: Not all devices have memory-mapped write latches. Refer to the specific device data sheet for details, including

number of latches implemented and upper address boundary.

DEVID (2)

Reserved

FF0000h

800000h

7FFFFEh

Reserved

xxxx00h (2)

xxxxFEh(2)

Unimplemented

Read ‘

’

FF0002h

FF0004h

F7FFFEh

F80000h

F800xxh (2)

Device Configuration Registers

F9FFFEh

FA0000h

FA00xxh

Flash Write Latches (Mapped)

(4)

Vector Area

User Flash Program Memory

Flash Configuration Words

(3)

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	PIC24F08KM102

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