PIC18F242 datasheet(37/332 Pages) MICROCHIP

tên linh kiện	PIC18F242

Giải thích chi tiết về linh kiện	High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D

PDF	332 Pages

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nhà sản xuất	MICROCHIP [Microchip Technology]

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DS39564C-page 35

PIC18FXX2

4.0

MEMORY ORGANIZATION

There are three memory blocks in Enhanced MCU

devices. These memory blocks are:

• Program Memory

• Data RAM

• Data EEPROM

Data and program memory use separate busses,

which allows for concurrent access of these blocks.

Additional detailed information for FLASH program

memory and Data EEPROM is provided in Section 5.0

and Section 6.0, respectively.

4.1

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 PIC18F252 and PIC18F452 each have 32 Kbytes

FLASH

memory,

while

the

PIC18F242

and

PIC18F442 have 16 Kbytes of FLASH. This means that

PIC18FX52 devices can store up to 16K of single word

instructions, and PIC18FX42 devices can store up to

8K of single word instructions.

The RESET vector address is at 0000h and the

interrupt vector addresses are at 0008h and 0018h.

Figure 4-1 shows the Program Memory Map for

PIC18F242/442 devices and Figure 4-2 shows the

Program Memory Map for PIC18F252/452 devices.

PIC18F242 bảng dữ liệu(PDF) 37 Page - Microchip Technology