DV164136 Microchip Technology, DV164136 Datasheet - Page 65

• Manufacturer Part Number: DV164136
• Description: DEVELOPMENT KIT FOR PIC18
• Manufacturer: Microchip Technology
• Series: PIC®r
• Type: MCUr

Specifications of DV164136

• Contents: Board, Cables, CDs, PICkit™ 3 Programmer, Power Supply
• Processor To Be Evaluated: PIC18F8722, PIC18F87J11
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V, 5 V
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F8xxx
• Kit Contents: PIC18 Exp Brd PICkit 3 Cable CD PSU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC18F8722, PIC18F87J11
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.1.3
The 80-pin devices in this family can address up to a
total of 2 Mbytes of program memory. This is achieved
through the external memory bus. There are two
distinct operating modes available to the controllers:
• Microcontroller (MC)
• Extended Microcontroller (EMC)
The program memory mode is determined by setting
the EMB Configuration bits (CONFIG3L<5:4>), as
shown in Register 5-1. (See also Section 24.1
“Configuration Bits” for additional details on the
device Configuration bits.)
The program memory modes operate as follows:
• The Microcontroller Mode accesses only on-chip
REGISTER 5-1:
© 2009 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5-4
bit 3
bit 2-0
Note 1:
Flash memory. Attempts to read above the top of
on-chip memory causes a read of all ‘0’s (a NOP
instruction).
The Microcontroller mode is also the only operating
mode available to 64-pin devices.
R/WO-1
WAIT
(1)
Implemented only on 80-pin devices.
PIC18F8XJ11/8XJ16 PROGRAM
MEMORY MODES
WAIT: External Bus Wait Enable bit
1 = Wait states on the external bus are disabled
0 = Wait states on the external bus are enabled and selected by MEMCON<5:4>
BW: Data Bus Width Select bit
1 = 16-Bit Data Width modes
0 = 8-Bit Data Width modes
EMB1:EMB0: External Memory Bus Configuration bits
11 = Microcontroller mode, external bus disabled
10 = Extended Microcontroller mode, 12-bit address width for external bus
01 = Extended Microcontroller mode, 16-bit address width for external bus
00 = Extended Microcontroller mode, 20-bit address width for external bus
EASHFT: External Address Bus Shift Enable bit
1 = Address shifting enabled – external address bus is shifted to start at 000000h
0 = Address shifting disabled – external address bus reflects the PC value
Unimplemented: Read as ‘0’
R/WO-1
BW
CONFIG3L: CONFIGURATION REGISTER 3 LOW
(1)
WO = Write-Once bit
W = Writable bit
‘1’ = Bit is set
R/WO-1
EMB1
(1)
(1)
R/WO-1
EMB0
(1)
(1)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
EASHFT
PIC18F87J11 FAMILY
R/WO-1
• The Extended Microcontroller Mode allows
The setting of the EMB Configuration bits also controls
the address bus width of the external memory bus. This
is covered in more detail in Section 7.0 “External
Memory Bus”.
In all modes, the microcontroller has complete access
to data RAM.
Figure 5-3 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 5-2.
(1)
access to both internal and external program
memories as a single block. The device can
access its entire on-chip program memory; above
this, the device accesses external program
memory up to the 2-Mbyte program space limit.
Execution automatically switches between the
two memories as required.
(1)
(1)
U-0
—
x = Bit is unknown
U-0
—
DS39778D-page 65
U-0
—
bit 0