DV164136 Microchip Technology, DV164136 Datasheet - Page 66

• 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

PIC18F87J11 FAMILY
5.1.4
By default, devices in Extended Microcontroller mode
directly present the program counter value on the
external address bus for those addresses in the range
of the external memory space. In practical terms, this
means addresses in the external memory device below
the top of on-chip memory are unavailable.
FIGURE 5-3:
TABLE 5-2:
DS39778D-page 66
Microcontroller
Extended Microcontroller
Legend:
Note 1:
On-Chip
Program
On-Chip
Memory
Memory
Reads
as ‘0’s
Space
Microcontroller Mode
Operating Mode
2:
3:
000000h
(Top of Memory)
(Top of Memory) + 1
1FFFFFh
EXTENDED MICROCONTROLLER
MODE AND ADDRESS SHIFTING
(Top of Memory) represents upper boundary of on-chip program memory space (see Figure 5-1 for device-specific
values). Shaded areas represent unimplemented, or inaccessible areas, depending on the mode.
This mode is the only available mode on 64-pin devices and the default on 80-pin devices.
These modes are only available on 80-pin devices.
Addresses starting at the top of the program memory are translated to start at 0000h of the external device
whenever the EASHFT Configuration bit is set.
MEMORY ACCESS FOR PIC18F8X11/8616 PROGRAM MEMORY MODES
MEMORY MAPS FOR PIC18F87J11 FAMILY PROGRAM MEMORY MODES
(1)
Execution
From
External
Memory
External
Memory
Access
Yes
Yes
Space
No
Extended Microcontroller Mode
Internal Program Memory
Table Read
On-Chip
On-Chip
Program
Memory
Memory
Mapped
External
Memory
From
Space
Space
Yes
Yes
to
000000h
(Top of Memory)
(Top of Memory) + 1
1FFFFFh
Table Write
Yes
Yes
To avoid this, the Extended Microcontroller mode
implements an address shifting option to enable auto-
matic address translation. In this mode, addresses
presented on the external bus are shifted down by the
size of the on-chip program memory and are remapped
to start at 0000h. This allows the complete use of the
external memory device’s memory space as an
extension of the device’s on-chip program memory.
To
(2)
Execution
No Access
External
Memory
External
Memory
Space
From
Yes
Extended Microcontroller Mode
External Program Memory
with Address Shifting
© 2009 Microchip Technology Inc.
On-Chip
Program
On-Chip
Memory
Mapped
External
Memory
Memory
Table Read
No Access
Space
Space
to
From
Yes
000000h
(Top of Memory) + 1
1FFFFFh
(Top of Memory)
1FFFFFh –
(Top of Memory)
Table Write
(2)
No Access
Yes
To
(3)