PIC18F45J10 FAMILY
6.1.1
HARD MEMORY VECTORS
6.1.2
FLASH CONFIGURATION WORDS
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.
Because PIC18F45J10 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.
PIC18 devices also have two interrupt vector
addresses for the handling of high-priority and low-
priority interrupts. The high-priority interrupt vector is
located at 0008h and the low-priority interrupt vector is
at 0018h. Their locations in relation to the program
memory map are shown in Figure 6-2.
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 end-
ing with the upper byte of CONFIG4. For these devices,
only Configuration Words, CONFIG1 through
CONFIG3, are used; CONFIG4 is reserved. The actual
addresses of the Flash Configuration Word for devices
in the PIC18F45J10 family are shown in Table 6-1.
Their location in the memory map is shown with the
other memory vectors in Figure 6-2.
FIGURE 6-2:
HARD VECTOR AND
CONFIGURATION WORD
LOCATIONS FOR
PIC18F45J10 FAMILY
DEVICES
Additional details on the device Configuration Words
are provided in Section 21.1 “Configuration Bits”.
TABLE 6-1:
FLASH CONFIGURATION
WORD FOR PIC18F45J10
FAMILY DEVICES
0000h
Reset Vector
High-Priority Interrupt Vector
Low-Priority Interrupt Vector
0008h
0018h
Program
Memory
(Kbytes)
Configuration
Word
Addresses
Device
PIC18F24J10
PIC18F44J10
PIC18F25J10
PIC18F45J10
16
32
3FF8h to 3FFFh
7FF8h to 7FFFh
On-Chip
Program Memory
(Top of Memory-7)
(Top of Memory)
Flash Configuration Words
Read ‘0’
1FFFFFh
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.
DS39682E-page 52
© 2009 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
