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The need for listing all the different categories of con guration fuse has not gone away, but the task has been simpli ed somewhat. You can put in multiple __CONFIG directives, and I recommend that you do so to keep track of the different features with respect to the register. This means that instead of loading up all the con guration values on one line, I recommend that you use the following format to ensure that no values are missed and that you can cross-reference to the datasheet very easily:
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__con g osc=hs, wdt=off __con g pwrte=on __con g cp=off, cpd=off ; 0x300000L ; 0x300000H ; 0x300002L
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BASIC OPERATING FEATURES
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OPTION Register
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The OPTION register is a cornerstone register to operation of the PIC microcontroller. This register controls operation and delay of the prescaler, selects the clock source, and speci es operation of the interrupt source pin. It is a very useful register and one that you always should keep in the back of your mind and make sure that it is set up properly for your application. Table 9.8 shows the low-end chip s OPTION register de nition, and Table 9.9 shows the mid-range PIC microcontroller s OPTION register de nition. The functions provided by the OPTION register are provided in multiple registers in the PIC18. PIC17 microcontrollers do not have an OPTION register because many of the functions continued by option are either not present (such as the prescaler and PortB weak pull-ups) or are provided in other registers.
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TABLE 9.8 BIT LOW-END PIC MICROCONTROLLER OPTION REGISTER DEFINITION LABEL/FUNCTION
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7 6 5
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_GPWU enables wakeup on pin change (not available on all devices) _GPPU enable I/O PortB weak pull-ups (not available on all devices) TOCS TMR0 clock source select 1 Tock1 pin 0 instruction clock
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TOSE TMR0 increment source edge select 1 high to low on Tock1 pin 0 low to high on Tock1 pin
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PSA prescaler assignment bit 1 prescaler assigned to watchdog timer 0 prescaler assigned to TMR0
PS2 PS0 prescaler rate select 000 1:1 001 1:2 010 1:4 011 1:8 100 1:16 101 1:32 110 1:64 111 1:128
OPTION REGISTER
TABLE 9.9 MID-RANGE PIC MICROCONTROLLER OPTION REGISTER DEFINITION BIT LABEL/FUNCTION
_RBPU enables PortB weak pull-ups 1 pull-ups disabled 0 pull-ups enabled
INTEDG interrupts request on 1 low to high on RBO/INT 0 high to low on RBO/INT
TOCS TMR0 clock source select 1 Tock1 pin 0 instruction clock
TOSE TMR0 update edge select 1 increment on high to low 0 increment on low to high
PSA prescaler assignment bit 1 prescaler assigned to watchdog timer 0 prescaler assigned to TMR0
PS2 PS0 prescaler rate select 000 1:1 001 1:2 010 1:4 011 1:8 100 1:16 101 1:32 110 1:64 111 1:128
Updating the OPTION register in a low-end device is accomplished by the option instruction, which moves the contents of the w register into the OPTION_REG (which is the MPLAB label for the OPTION register). The OPTION register of mid-range devices can be written to using the option instruction, as in low-end devices, or by setting the RPO bit or the STATUS register and accessing it at address one. The address of the OPTION_REG is 0x081 or 0x001 in bank 1 of the address space.
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Using the option instruction is not recommended in mid-range devices and may not be supported in them in the future. Instead, writing to the OPTION register directly from bank 1 always should be used; except for a few special cases, which I will explain below, the option instruction should never be used.
PARALLEL INPUT/OUTPUT
The most basic way of getting data in and out of the PIC microcontroller is via the parallel I/O bits that are located in the ports. In many PIC microcontroller s, these pins have peripherals behind them to provide advanced I/O capabilities. Despite this capability, in virtually every PIC microcontroller application that you create, the straight I/O port functions will be required. The PIC microcontroller s typical I/O pin is capable of being either an input pin or an output pin. When in output mode, the pins are able to source or sink roughly 20 mA of current. The block diagram of a PIC microcontroller I/O pin is shown in Fig. 9.19. Each register port is made up of a number of these circuits, one for each I/O bit. Depending on your previous experience, this I/O pin can look as if it is very complex, needlessly complex, or pretty basic. When you compare this controller with other microcontrollers, you ll nd the PIC microcontroller s I/O pins are very typical of some devices and more complex than others are. Regardless of your own feelings about the I/O pins, there are a few aspects of the pins that you should be aware of. I/O pins are associated with the bit number of the port to which they belong. The maximum size for an I/O port is 8 bits (or pins) for 1 byte, and you will nd that for many devices there are ports with fewer than 8 bits. The convention used by Microchip is to label the pins according to their bit number and the with which port they re associated. The convention is R%#, where % is the port letter (port A, port B, etc.) and # is the bit number of the port. Using this convention, RB3 is port B, pin 3, and I will use it
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