PIC18F2331 datasheet(59/396 Pages) MICROCHIP

59 / 396 page

 2003 Microchip Technology Inc.

Preliminary

DS39616B-page 57

PIC18F2331/2431/4331/4431

5.0

MEMORY ORGANIZATION

There are three memory types in enhanced MCU

devices. These memory types are:

• Program Memory

• Data RAM

• Data EEPROM

Data and program memory use separate busses,

which allows for concurrent access of these types.

Additional detailed information for Flash program mem-

ory and data EEPROM is provided in Section 6.0

“Flash Program Memory” and Section 7.0 “Data

EEPROM Memory”, respectively.

FIGURE 5-1:

PROGRAM MEMORY MAP

AND STACK FOR

PIC18F2331/4331

5.1

Program Memory Organization

A 21-bit program counter is capable of addressing the

2-Mbyte program memory space. Accessing a location

between the physically implemented memory and the

2-Mbyte address will cause a read of all ‘0’s (a NOP

instruction).

The

PIC18F2331

and

PIC18F4331

each

have

8 Kbytes of Flash memory and can store up to 4,096

single-word instructions.

The

PIC18F2431

and

PIC18F4431

each

have

16 Kbytes of Flash memory and can store up to 8,192

single-word instructions.

The Reset vector address is at 000000h and the

interrupt vector addresses are at 000008h and

000018h.

The Program Memory Maps for PIC18F2X31 and

PIC18F4X31 devices are shown in Figure 5-1 and

Figure 5-2, respectively.

FIGURE 5-2:

PROGRAM MEMORY MAP

AND STACK FOR

PIC18F2431/4431

PC<20:0>

Stack Level 1

•

Stack Level 31

Reset Vector LSb

High Priority Interrupt Vector LSb

•

CALL,RCALL,RETURN

RETFIE,RETLW

000000h

000008h

000018h

1FFFFFh

Low Priority Interrupt Vector LSb

On-Chip Flash

Program Memory

002000h

001FFFh

Unused -

Read ‘0’s

PC<20:0>

Stack Level 1

•

Stack Level 31

Reset Vector LSb

High Priority Interrupt Vector LSb

•

CALL,RCALL,RETURN

RETFIE,RETLW

000000h

000008h

000018h

1FFFFFh

Low Priority Interrupt Vector LSb

On-Chip Flash

Program Memory

004000h

003FFFh

Unused -

Read ‘0’s

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