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The goto statement might seem a bit more complex than is necessary, but the ($ & 0x1800) ORed with the page offset of the destination will add the appropriate high order bits to avoid an assembly message stating that the address is outside of the current page. This code is like the XORing of the register address bits to prevent any messages being produced by MPASM that indicate that an invalid access is taking place. Along with the bit test (btfsc and btfss) instructions, there are two other instructions that skip on a given instruction. They increment or decrement a register and skip
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Figure 7.37 The incfsz instruction increments the contents of the speci ed register and skips the next one if the result is equal to zero.
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the next instruction if the result is equal to zero. Figure 7.37 shows the operation of the incfsz instruction while the instruction format is:
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In the incfsz instruction, the contents of Register are incremented and stored according to the value of d. If d is w or 0, then WREG is stored with the result of the operation. If d is f or 1, then the Register is updated with the result of the operation. No STATUS ags are modi ed by the operation of incfsz or decfsz (which is a difference between them and the incf and decf instructions). decfsz is similar in operation to incfsz except the Register is decremented and the skip takes place if the result is equal to zero. Its format is:
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These two instructions work exactly the same as the incf and decf instructions in terms of data processing: 1 is added or subtracted from Register. The result is then stored either in w or back in the source register. The important difference is these instructions is that if the result is equal to zero following the increment/decrement, the next instruction is skipped. If the result is not equal to zero (and the next instruction is not skipped), incfsz and decfsz execute in one instruction cycle. incfsz and decfsz execute in two instruction cycles if the result is equal to zero. If the result is zero, then the next instruction is skipped over and treated like a nop. Often these instructions are used in critically timed loops, so understanding the exact timing of the two instructions can be critical. This means that decfsz and incfsz can be used for loop control operations. Actually, I should say that decfsz is normally used for loop control. The code example
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below can be added to InsTemplate.asm to show how a loop can be repeated 37 times with very little software overhead:
movlw movwf Loop: ; 37 0x20 ; ; Load the Count Register Repeat for each iteration of the loop
Instructions in the loop normally go here decfsz goto 0x20, f Loop ; ; ; Decrement the Count Register If not == zero, loop again Continue on with the Program
This code can be used anywhere a loop is required and, as you can see, the code required to implement it is only four instructions long and only requires two or three instruction cycles each loop. A couple of notes on the incfsz and decfsz instructions: if you are using them on processor registers, care should be taken to ensure that the hardware registers are capable of reaching zero. In the low-end PIC microcontrollers, the FSR can never be equal to zero, which makes the incfsz and decfsz instructions useless. As well, these instructions do not affect any status ags (zero would probably be expected). This means that you may want to put a bsf STATUS, Z after the instruction following the incfsz/decfsz instruction to indicate that the loop has nished because the variable being decremented has reached zero:
decfsz goto bsf Count Loop STATUS, Z ; Decrement the Count Value ; Jump back to Loop if Count != 0 Set Zero Flag to Indicate Loop End
Tables So far I have touched upon explicitly changing the contents of the PIC micro-
controller s program counter to provide explicit jumps within an application. As I work through some of the more advanced programming techniques that can be used with the PIC microcontroller, the need to arithmetically calculate an address to jump to will become more obvious. The table programming construct in the PIC microcontroller is one that requires arithmetically calculated goto addresses that I am sure you will use a lot of in your application programming. When implementing a PIC microcontroller application that can communicate with humans, the ability to send text messages will be required. Tables of text messages can be implemented in the PIC microcontroller quite simply with the advantage that they will execute quickly and with a consistent number of cycles, no matter where the data in the table to be retrieved is. The most traditional method of implementing a table is to provide a subroutine that adds a constant to a known point in the application and stores this value in the PIC microcontroller s program counter. At the new address, a retlw instruction is used to store the table value in WREG and return to the caller s code.
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