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CONFIGURATION FUSES
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TABLE 9.2 LABEL
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PIC18F877 CONFIGURATION FUSE LABELS AND VALUES VALUE OPERATION
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_BODEN_ON _BODEN_OFF _CP_ALL _CP_OFF _WRT_256 _WRT_1FOURTH _WRT_HALF _PWRTE_OFF _PWRTE_ON _WDT_ON _WDT_OFF _LP_OSC _XT_OSC _HS_OSC _RC_OSC _DEBUG_ON _DEBUG_OFF _CPD_ON _CPD_OFF _LVP_ON _LVP_OFF
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0x03FFF 0x03FBF 0x01FFF 0x03FFF 0x03DFF 0x03BFF 0x039FF 0x03FFF 0x03FF7 0x03FFF 0x03FFB 0x03FFC 0x03FFD 0x03FFE 0x03FFF 0x037FF 0x03FFF 0x03EFF 0x03FFF 0x03FFF 0x03F7F
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Brown-out reset detect enabled Brown-out reset detect disabled All program memory protected No program memory write protection Upper 256 bytes of program memory write protected First quarter of program memory write protected First half of program memory write protected 72-ms time up delay off 72-ms time up delay on Watchdog timer on Watchdog timer off LP oscillator type XT oscillator type HS oscillator type RC oscillator Internal emulator enabled Internal emulator disabled Data EEPROM write protected Data EEPROM not write protected Low-voltage program enabled Low-voltage program disabled
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_LVP_OFF. If available, this feature should be disabled because it uses some I/O pins
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for controlling the low-voltage programming.
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_DEBUG_OFF. If you are not using an MPLAB ICD 2 to debug the application.
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Reset and clocking options will be speci c to the device you are using, but when you are starting out, I recommend that you select internal options (if they are available). After listing the different options, the _CONFIG statement for the application can be created like the following MPASM statment:
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__CONFIG _BODEN_ON & _CP_OFF & _WRTE_ENABLE_ON & _PWRTE_ON & _WDT_OFF & _XT_OSC & _DEBUG_OFF & _CPD_ON & _LVP_OFF
BASIC OPERATING FEATURES
TABLE 9.3 PIC18F877A CONFIGURATION CONTROLLABLE HARDWARE FEATURES GROUPED BY __CONFIG PARAMETER NAMES LABEL OPTION
_BODEN_## _CP_## _WRT _## _PWRTE_## _##_OSC _DEBUG_## _CPD_## _LVP_##
Brown-out detect Code protect Program memory application write enable 72-ms power-up wait timer Oscillator type Built-in emulator Data EEPROM write enable Low-voltage programming enable
When this statement is evaluated, the constant values are replaced with the constants values located in the .inc le and evaluated together into a constant to be loaded into the con guration bits. For the labels selected earlier, the __CONFIG statement could be reduced to
__CONFIG 0x03F71
which is the value that will be loaded into the con guration fuse register.
SYSTEM CLOCK/OSCILLATORS
There are four different methods of clocking the PIC microcontroller. The different options are designed to ll different application requirements for cost, speed, and accuracy. There are few applications that require extreme accuracy, so cheaper clock designs are more usual. The clock/oscillator options are
1 2 3 4
Internal oscillators External resistors and capacitors Crystals and ceramic resonators External oscillators
Internal oscillators A feature that is becoming more and more prevalent in low-cost PIC microcontrollers is the built-in RC oscillator, as shown in Fig. 9.7, which can be used in place of external oscillator circuitry. The OSCAL register is loaded with a calibration value determined by Microchip during the manufacturing process. This type of oscillator will have an accuracy of 1.0 percent or better while running at 4 MHz. The internal oscillator simpli es application wiring, and if it is used, the pins that are normally used by it can be used as I/O pins, which improves the ef ciency of small-pin-count devices.
CONFIGURATION FUSES
PICMicro Clock
Programmable Resistor
OSCCAL
Figure 9.7 The internal oscillator consists of a builtin RC oscillator with a calibration register.
The rst parts that were built had this circuit, but in the last few years, a number of different parts have become available with two built-in oscillators running at 8 MHz and 31 kHz, as shown in Fig. 9.8. Operation of the oscillators, along with the value passed to the rst multiplexor from the postscaler, can provide a system clock of 31, 125, 250, and 500 kHz and so on up to 8 MHz, giving you a considerable range of operating speeds. Unlike the 4-MHz oscillator of the rst PIC microcontrollers built with internal oscillators, this circuit allows for the execution speed of the chip to be changed during operation to minimize power drain, except when you need to perform complex calculations very quickly.
External resistors and capacitors Before introduction of the internal oscillator,
if you wanted a very-low-cost oscillator circuit, you would have to go with the external RC oscillator option, which consisted of a resistor-capacitor network that provides the clocking for the PIC microcontroller, as shown in Fig. 9.9. The resistor-capacitor charging/discharging voltage is buffered through a Schmidt Trigger noninverting buffer, which is used to enable or disable an N-channel MOSFET transistor pull-down switch. This circuit is quite simple but only accurate to about 10 percent, and it really should not be considered for applications when the internal oscillator is available with no external components and better accuracy.
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