PIC18F6310ESLASHPTSQTP datasheet(64/404 Pages) MICROCHIP

64 / 404 page

PIC18F6310/6410/8310/8410

DS39635A-page 62

Preliminary

 2004 Microchip Technology Inc.

5.1.1

PIC18F8310/8410 PROGRAM

MEMORY MODES

In addition to available on-chip FLASH program

memory, 80-pin devices in this family can also address

up to 2 Mbytes of external program memory through an

external memory interface. There are four distinct

operating modes available to the controllers:

• Microprocessor (MP)

• Microprocessor with Boot Block (MPBB)

• Extended Microcontroller (EMC)

• Microcontroller (MC)

The program memory mode is determined by setting

the two Least Significant bits of the CONFIG3L config-

uration byte, as shown in Register 5-1. (See also

Section 23.1 “Configuration Bits” for additional

details on the device configuration bits.)

The program memory modes operate as follows:

•The Microcontroller Mode accesses only on-chip

Flash memory. Attempts to read above the physical

limit of the on-chip Flash (3FFFh) causes a read of

all ‘0’s (a NOP instruction). The Microcontroller mode

is also the only operating mode available to

PIC18F6310 and PIC18F6410 devices.

•The Extended Microcontroller Mode allows

access to both internal and external program

memories as a single block. The device can

access its entire on-chip Flash memory; above

this, the device accesses external program

memory up to the 2-Mbyte program space limit.

As with Boot Block mode, execution automatically

switches between the two memories as required.

•The Microprocessor Mode permits access only

to external program memory; the contents of the

on-chip Flash memory is ignored. The 21-bit

program counter permits access to the entire

2-Mbyte linear program memory space.

• The Microprocessor with Boot Block Mode

accesses on-chip Flash memory from addresses

000000h to 0007FFh. Above this, external program

memory is accessed all the way up to the 2-Mbyte

limit. Program execution automatically switches

between the two memories as required.

In all modes, the microcontroller has complete access

to data RAM.

Figure 5-2 compares the memory maps of the different

program memory modes. The differences between

on-chip and external memory access limitations are

more fully explained in Table 5-1.

CONFIG3L: CONFIGURATION BYTE REGISTER 3 LOW

R/P-1

U-0

R/P-1

WAIT

—

—PM1

PM0

bit 7

bit 0

bit 7

WAIT: External Bus Data Wait Enable bit

= Wait selections unavailable, device will not wait

= Wait programmed by WAIT1 and WAIT0 bits of MEMCOM register (MEMCOM<5:4>)

bit 6

BW: External Bus Data Width Select bit

= 16-bit external bus data width

= 8-bit external bus data width

bit 5-2

Unimplemented: Read as ‘0’

bit 1-0

PM1:PM0: Processor Data Memory Mode Select bits

= Microcontroller mode

= Microprocessor mode(1)

= Microcontroller with Boot Block mode(1)

= Extended Microcontroller mode(1)

Note 1: This mode is available only on PIC18F8410 devices.

Legend:

R = Readable bit

P = Programmable bit U = Unimplemented bit, read as ‘0’

-n = Value after erase

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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