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PIC18LF26J53 Datasheet(PDF) 82 Page - Microchip Technology |
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PIC18LF26J53 Datasheet(HTML) 82 Page - Microchip Technology |
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PIC18F47J53 FAMILY DS39964B-page 82 Preliminary 2010 Microchip Technology Inc. 6.1.1 HARD MEMORY VECTORS All PIC18 devices have a total of three hard-coded return vectors in their program memory space. The Reset vector address is the default value to which the program counter returns on all device Resets; it is located at 0000h. PIC18 devices also have two interrupt vector addresses for handling high-priority and low-priority interrupts. The high-priority interrupt vector is located at 0008h and the low-priority interrupt vector at 0018h. Figure 6-2 provides their locations in relation to the program memory map. FIGURE 6-2: HARD VECTOR AND CONFIGURATION WORD LOCATIONS FOR PIC18F47J53 FAMILY DEVICES 6.1.2 FLASH CONFIGURATION WORDS Because PIC18F47J53 family devices do not have persistent configuration memory, the top four words of on-chip program memory are reserved for configuration information. On Reset, the configuration information is copied into the Configuration registers. The Configuration Words are stored in their program memory location in numerical order, starting with the lower byte of CONFIG1 at the lowest address and ending with the upper byte of CONFIG4. Table 6-1 provides the actual addresses of the Flash Configuration Word for devices in the PIC18F47J53 family. Figure 6-2 displays their location in the memory map with other memory vectors. Additional details on the device Configuration Words are provided in Section 28.1 “Configuration Bits”. TABLE 6-1: FLASH CONFIGURATION WORD FOR PIC18F47J53 FAMILY DEVICES Reset Vector Low-Priority Interrupt Vector 0000h 0018h On-Chip Program Memory High-Priority Interrupt Vector 0008h 1FFFFFh (Top of Memory) (Top of Memory-7) Flash Configuration Words Read as ‘0’ Legend: (Top of Memory) represents upper boundary of on-chip program memory space (see Figure 6-1 for device-specific values). Shaded area represents unimplemented memory. Areas are not shown to scale. Device Program Memory (Kbytes) Configuration Word Addresses PIC18F26J53 64 FFF8h to FFFFh PIC18F46J53 PIC18F27J53 128 1FFF8h to 1FFFFh PIC18F47J53 |
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