PIC18F6410-I/PT【PDF 5/411 页】IC PIC MCU FLASH 8KX16 64TQFP

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PIC18F66K80 FAMILY

DS39977F-page 102

2010-2012 Microchip Technology Inc.

6.1

Program Memory Organization

PIC18 microcontrollers implement a 21-bit Program

Counter (PC) that is capable of addressing a 2-Mbyte

program memory space. Accessing a location between

the upper boundary of the physically implemented

memory and the 2-Mbyte address will return all ‘0’s (a

NOP

instruction).

The entire PIC18F66K80 family offers a range of

on-chip Flash program memory sizes, from 32 Kbytes

(16,384 single-word instructions) to 64 Kbytes

(32,768 single-word instructions).

PIC18F25K80, PIC18F45K80 and PIC18F65K80 –

32 Kbytes of Flash memory, storing up to

16,384 single-word instructions

PIC18F26K80, PIC18F46K80 and PIC18F66K80 –

64 Kbytes of Flash memory, storing up to

32,768 single-word instructions

The program memory maps for individual family

members are shown in Figure 6-1.

6.1.1

HARD MEMORY VECTORS

All PIC18 devices have a total of three hard-coded

return vectors in their program memory space. The

Reset vector address is the default value to which the

Program Counter returns on all device Resets. It is

located at 0000h.

PIC18 devices also have two interrupt vector

addresses for handling high-priority and low-priority

interrupts. The high-priority interrupt vector is located at

0008h and the low-priority interrupt vector is at 0018h.

The locations of these vectors are shown, in relation to

the program memory map, in Figure 6-2.

FIGURE 6-2:

HARD VECTOR FOR

PIC18F66K80 FAMILY

DEVICES

Reset Vector

Low-Priority Interrupt Vector

0000h

0018h

On-Chip

Program Memory

High-Priority Interrupt Vector

0008h

1FFFFFh

Read ‘0’

Legend:

(Top of Memory) represents upper boundary

of on-chip program memory space (see

Figure 6-1 for device-specific values).

Shaded area represents unimplemented

memory. Areas are not shown to scale.

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