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PIC18F24K20 Datasheet(PDF) 9 Page - Microchip Technology |
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PIC18F24K20 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 42 page  © 2009 Microchip Technology Inc. Advance Information DS41297F-page 9 PIC18F2XK20/4XK20 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 program- mer 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 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 PIC18F2XK20/4XK20 DEVICES TBLPTRU TBLPTRH TBLPTRL Addr[21:16] Addr[15:8] Addr[7:0] ID Location 1 200000h ID Location 2 200001h ID Location 3 200002h ID Location 4 200003h ID Location 5 200004h ID Location 6 200005h ID Location 7 200006h ID Location 8 200007h CONFIG1L 300000h CONFIG1H 300001h CONFIG2L 300002h CONFIG2H 300003h CONFIG3L 300004h CONFIG3H 300005h CONFIG4L 300006h CONFIG4H 300007h CONFIG5L 300008h CONFIG5H 300009h CONFIG6L 30000Ah CONFIG6H 30000Bh CONFIG7L 30000Ch CONFIG7H 30000Dh Device ID1 3FFFFEh Device ID2 3FFFFFh Note: Sizes of memory areas are not to scale. 000000h 1FFFFFh 3FFFFFh 01FFFFh Code Memory Unimplemented Read as ‘0’ Configuration and ID Space 2FFFFFh |
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