PIC18F1220ESLASHPQTP datasheet(43/308 Pages) MICROCHIP

43 / 308 page

DS39605F-page 41

PIC18F1220/1320

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

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>

Stack Level 1

•

Stack Level 31

Reset Vector

Low Priority Interrupt Vector

•

CALL,RCALL,RETURN

RETFIE,RETLW

0000h

0018h

On-Chip

Program Memory

High Priority Interrupt Vector 0008h

1FFFFFh

1000h

0FFFh

Read ‘0’

200000h

PC<20:0>

Stack Level 1

•

Stack Level 31

Reset Vector

Low Priority Interrupt Vector

•

CALL,RCALL,RETURN

RETFIE,RETLW

0000h

0018h

2000h

1FFFh

On-Chip

Program Memory

High Priority Interrupt Vector 0008h

Read ‘0’

1FFFFFh

200000h

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