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MPLAB ? ICE 4000 User’s Guide
FIGURE 5-1:
MEMORY MAPS FOR PROGRAM MEMORY MODES
Microprocessor
Mode (MP)
Microprocessor
with Boot Block
Mode (MPBB)
Microcontroller
Mode (MC)
Extended
Microcontroller
Mode (EMC)
000000h
On-Chip
000000h
000000h
000000h
Program
Memory
(No
access)
Boot
Boot+1
On-Chip
Program
Memory
Boundary
Boundary+1
On-Chip
Program
Memory
Boundary
Boundary+1
On-Chip
Program
Memory
External
Program
Reads
xxxxxxh
Memory
xxxxxxh
External
Program
Memory
xxxxxxh
‘ 0 ’s
xxxxxxh
External
Program
Memory
External
Memory
On-Chip
Flash
External
Memory
On-Chip
Flash
On-Chip
Flash
External
Memory
On-Chip
Flash
Boot – End of boot block.
Boundary – End of on-chip program memory.
xxxxxxh – End of accessible program memory. Defined by size of program counter.
5.3.1
Program Counter
The size of the program counter will determine how much program memory can be
accessed, i.e., a 21-bit program counter permits access to a 2-Mbyte (1-Mword)
program memory space (on-chip, off-chip or a combination of both types of program
memory.)
5.3.2
Configuration Bits
A Program Memory mode is set by using configuration bits. Depending on the device,
the Processor Mode Select bits are located in a configuration register which is
programmed when the device is programmed. For more information, consult the device
data sheet section “Special Features of the CPU”.
5.3.3
External Memory Interface
The External Memory Interface is a feature of a PIC18F8XXX device that allows the
microcontroller to access external memory devices (such as Flash, EPROM, SRAM,
etc.) as program or data memory.
Using the MEMCON register, the following may be configured:
? External bus enable and disable
? 16-Bit Mode – Word Write mode, Byte Select mode or Byte Write mode
? Wait – Table read/write bus cycle wait counts (0-3 T CY )
For more information, see the External Memory Interface section of the device data
sheet.
DS51490A-page 28
? 2004 Microchip Technology Inc.
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