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bcf Register, Bit
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In the bcf instruction, the selected Bit of Register is reset. The operation of this instruction could be characterized as:
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Register = Register & (0x0FF ^ (1 << Bit))
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In this operation, the contents of Register are ANDed with a value that has all the bits set except for the one that you want to be reset. In the equation above, the << operation shifts the value 1 over Bit times to the left. When 1 has been shifted over Bit times to the left, it is XORed with 0x0FF, resulting in the speci ed bit reset. When this is ANDed with the contents of the register, that bit will be reset.
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USING THE PIC MCU INSTRUCTION SET
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Figure 7.18 operation.
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The bcf single bit clear instruction
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The opposite instruction, bsf, which sets the register bit speci ed by the instruction as:
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bsf Register, Bit
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can be characterized by an equation:
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Register = Register | (1 << Bit)
In bsf, the value 1 is shifted to the left Bit number of times and ORed with the contents of Register. To demonstrate the operation of the bcf and bsf instructions, I recommend that you single-step through the InsTemplate.asm program:
movlw movwf bcf bsf 0xDF 0x20 0x20, 1 0x20, 5 ; Save Value to Change
; ; ;
Clear Bit 1 Set Bit 5 New Value is 0xFD
Both bcf and bsf are useful instructions when you just want to change the state of a single bit. They are paired with the btfsc and btfss instructions that test the state of a register bit and skip the next instruction accordingly. The bcf and bsf instructions belong in this section because they move new values into registers. The btfsc and btfss instructions are in the Execution Change Instructions section because they are the primary method that is used to conditionally change how a PIC microcontroller application is executing.
Bank addressing Bank addressing is a dif cult concept to understand, even if you are an experienced assembly language programmer. The need for banked register
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addressing goes back to how the PIC microcontroller s instructions are implemented; maintaining a single word for all instructions means that jump to addresses and register addresses restrict the amount of memory that can be accessed by the processor. Complicating the issue is the design of the PIC microcontroller and its ability to implement useful programs with suf cient variable memory without having to change the bank register (or the execution address page). Unfortunately, there are registers, such as the I/O port TRIS registers, which are located in another bank. This is the only situation where you need to understand how bank addressing works. A dif cult concept for new developers to understand is that execution really takes place in a single bank and you cannot directly access any other registers except for a feWREGs that are shadowed across multiple banks. One of these registers is the STATUS register, which contains the RP0 and RP1 bits that select which bank is active. Normally when execution starts, the PIC microcontroller defaults to bank 0. To change the active bank, you have to change the RP0 or RP1 to select the desired bank as shown in Fig. 7.19. To show how this works, start up MPLAB IDE with the InsTemplate.asm project and add the simple program:
movlw movwf bsf movwf 0x5A 0x20 STATUS, RP0 0x20 ; ; ; ; Value to write into registers Store at address 0x20 Change execution to Bank 1 Write to offset 0x20 in Bank 1
Single-step through the program and in the File Registers window, 0x5A will be written at address 0x20, which is what you would expect from the program. Continue single-stepping and you will see that the second movwf instruction writes 0x5A into address 0xA0 and not 0x20 (as you might expect).
Register Address:
0-0 7F
0 80-0 FF 0 100-0 7F 0 180-0 1FF
Bank 0
Bank 1
Bank 2
Bank Address
RP1/RP0:
Status RP0/RP1
Figure 7.19 Changing the active bank is accomplished by changing the value of the RP0 and RP1 bits in the STATUS register.
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