PMF18WE1 Microchip Technology, PMF18WE1 Datasheet - Page 34

• Manufacturer Part Number: PMF18WE1
• Description: PROCESSOR MODULE FOR ICE4000
• Manufacturer: Microchip Technology

Specifications of PMF18WE1

• Module/board Type: Processor Module
• Product: Microcontroller Modules
• Core Processor: PIC18F6585/6680/8585/8680
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: ICE4000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

MPLAB
DS51490A-page 28
xxxxxxh
000000h
Microprocessor
External
Memory
Mode (MP)
Program
External
Memory
ICE 4000 User’s Guide
FIGURE 5-1:
5.3.1
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
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
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
For more information, see the External Memory Interface section of the device data
sheet.
On-Chip
Program
Memory
access)
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.
(No
Program Counter
Configuration Bits
External Memory Interface
000000h
Boot
Boot+1
xxxxxxh
with Boot Block
Microprocessor
Mode (MPBB)
External
Memory
External
Program
Memory
MEMORY MAPS FOR PROGRAM MEMORY MODES
On-Chip
Program
Memory
On-Chip
Flash
000000h
Boundary
Boundary+1
xxxxxxh
Microcontroller
Mode (MC)
On-Chip
Program
Memory
On-Chip
Flash
Reads
‘0’s
CY
)
 2004 Microchip Technology Inc.
Boundary
Boundary+1
000000h
xxxxxxh
Microcontroller
Mode (EMC)
Extended
Program
External
External
Memory
Memory
On-Chip
Program
Memory
On-Chip
Flash