PIC18LF2XK22 Datasheet, PDF (9/42 Pages) Microchip Technology – Flash Memory Programming Specification

PIC18(L)F2XK22/4XK22
In addition to the code memory space, there are three
blocks in the configuration and ID space that are
accessible to the user through table reads and table
writes. Their locations in the memory map are shown in
Figure 2-10.
Users may store identification information (ID) in eight
ID registers. These ID registers are mapped in
addresses 200000h through 200007h. The ID locations
read out normally, even after code protection is applied.
Locations 300000h through 30000Dh are reserved for
the Configuration bits. These bits select various device
options and are described in Section 5.0 “Configura-
tion Word”. These Configuration bits read out
normally, even after code protection.
Locations 3FFFFEh and 3FFFFFh are reserved for the
device ID bits. These bits may be used by the
programmer to identify what device type is being
programmed and are described in Section 5.0
“Configuration Word”. These device ID bits read out
normally, even after code protection.
2.3.1 MEMORY ADDRESS POINTER
Memory in the address space, 0000000h to 3FFFFFh,
is addressed via the Table Pointer register, which is
comprised of three Pointer registers:
• TBLPTRU, at RAM address 0FF8h
• TBLPTRH, at RAM address 0FF7h
• TBLPTRL, at RAM address 0FF6h
TBLPTRU
Addr[21:16]
TBLPTRH
Addr[15:8]
TBLPTRL
Addr[7:0]
The 4-bit command, ‘0000’ (core instruction), is used to
load the Table Pointer prior to using any read or write
operations.
FIGURE 2-10:
CONFIGURATION AND ID LOCATIONS FOR PIC18(L)F2XK22/4XK22 DEVICES
000000h
01FFFFh
Code Memory
Unimplemented
Read as ‘0’
ID Location 1
ID Location 2
ID Location 3
ID Location 4
ID Location 5
ID Location 6
ID Location 7
ID Location 8
200000h
200001h
200002h
200003h
200004h
200005h
200006h
200007h
1FFFFFh
Configuration
and ID
Space
2FFFFFh
CONFIG1L
CONFIG1H
CONFIG2L
CONFIG2H
CONFIG3L
CONFIG3H
CONFIG4L
CONFIG4H
CONFIG5L
CONFIG5H
CONFIG6L
CONFIG6H
CONFIG7L
CONFIG7H
300000h
300001h
300002h
300003h
300004h
300005h
300006h
300007h
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
3FFFFFh
Note: Sizes of memory areas are not to scale.
Device ID1
Device ID2
3FFFFEh
3FFFFFh
 2010 Microchip Technology Inc.
Advance Information
DS41398B-page 9