Книга: Advanced PIC Microcontroller Projects in C

2.1.3 The Configuration Registers

2.1.3 The Configuration Registers

PIC18F452 microcontrollers have a set of configuration registers (PIC16-series microcontrollers had only one configuration register). Configuration registers are programmed during the programming of the flash program memory by the programming device. These registers are shown in Table 2.2. these registers are given in Table 2.3. Some of the more important configuration registers are described in this section in detail.

Table 2.2: PIC18F452 configuration registers

Legend: x = unknown, u = unchanged, – = unimplemented, q = value depends on condition. Shaded cells are unimplemented, read as ‘0’.

Table 2.3: PIC18F452 configuration register descriptions

The CONFIG1H configuration register is at address 300001H and is used to select the microcontroller clock sources. The bit patterns are shown in Figure 2.6.

Figure 2.6: CONFIG1H register bits 

The CONFIG2L configuration register is at address 300002H and is used to select the brown-out voltage bits. The bit patterns are shown in Figure 2.7.

Figure 2.7: CONFIG2L register bits

The CONFIG2H configuration register is at address 300003H and is used to select the watchdog operations. The bit patterns are shown in Figure 2.8.

Figure 2.8: CONFIG2H register bits

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