PIC18LF1320T-I/SOSQTP データシートの表示（PDF） - Microchip Technology

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PIC18LF1320T-I/SOSQTP

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

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

PIC18F1220

PC<20:0>

CALL,RCALL,RETURN

21

RETFIE,RETLW

Stack Level 1

••

•

Stack Level 31

Reset Vector

0000h

High Priority Interrupt Vector 0008h

Low Priority Interrupt Vector 0018h

On-Chip

Program Memory

0FFFh

1000h

PIC18F1220/1320

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 PIC18F1220 has 4 Kbytes of Flash memory and

can store up to 2,048 single-word instructions.

The PIC18F1320 has 8 Kbytes of Flash memory and

can store up to 4,096 single-word instructions.

The Reset vector address is at 0000h and the interrupt

vector addresses are at 0008h and 0018h.

The program memory maps for the PIC18F1220 and

PIC18F1320 devices are shown in Figure 5-1 and

Figure 5-2, respectively.

FIGURE 5-2:

PROGRAM MEMORY MAP

AND STACK FOR

PIC18F1320

PC<20:0>

CALL,RCALL,RETURN

21

RETFIE,RETLW

Stack Level 1

••

•

Stack Level 31

Reset Vector

0000h

High Priority Interrupt Vector 0008h

Low Priority Interrupt Vector 0018h

On-Chip

Program Memory

1FFFh

2000h

Read ‘0’

Read ‘0’

1FFFFFh

200000h

© 2007 Microchip Technology Inc.

1FFFFFh

200000h

DS39605F-page 41

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