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In both cases, the PIC microcontroller is able to change a bit and test its condition in fewer instructions and without affecting the contents of the accumulator or the STATUS register This very powerful feature is something to keep in mind when you are developing your applications By spending a few minutes planning on how the registers are going to operate, you can improve the ef ciency of your application by some remarkable margins Bit skip instructions are useful in a variety of cases, from checking interrupt active ag bits to seeing if a number is negative (checking the most signi cant bit) Throughout the book, I present a number of ways in which the bit skip commands can be used to simplify the software development.

FIG 9.4. It is apparent that effective temperature control cannot be obtained over very wide ranges by manipulation of flow rate.

The bit commands are quite unique to the PIC compared to other microcontrollers and I believe they give the application developer a signi cant advantage in developing simple applications that quickly and easily allow you to ef ciently manipulate bits in a variety of ways To nish off the discussion of bit skip and goto instructions, I should point out that there are a number of ways to conditionally jump to an address in another address page Probably the best way of doing this is to put the PCLATH change before any calculations that are required before the conditional goto as well as restoring the PCLATH register after the conditional goto.

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The restore is required in case the conditional goto doesn t execute and sometime later you are jumping within the current page; if the PCLATH register is not restored to its original value, then you will be jumping to an invalid address in another page The PCLATH register restore, shown in the example conditional interpage goto below, avoids the possibility of forgetting to restore PCLATH:.

movlw movwf movf subwf btfss goto movlw movwf HIGH LongJump ; PCLATH a, w ; b, w STATUS, Z (LongJump & 0x7FF) HIGH $ ; PCLATH PCLATH Set up for goto Conditional goto calculations

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

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.

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:

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: