By F. Stevens
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Additional info for Getting Started with PIC Microcontrollers
Movlw 0x2 ; Assume the value in W is given. ; Some instructions call selector ......... ; Some instructions. selector addwf PCL,1 retlw 0x41 retlw B’11010110’ retlw B’10110101’ retlw B’0x53 sel_end retlw 0x0 37 Assume that the number 2 has been loaded into W. The program counter (PC) always contains the address of the next instruction to be executed. When the program is at the call instruction, the PC will contain the appropriate address for that instruction. However, at the label selector, execution of the instruction addwf PCL will add the value in W to the PC, so that the program will branch to the new location.
1993.  Wilkinson B. , 1992.
Start the time delay. movlw 0xFF ; Fill the W register with 11111111. movwf delreg ; Move the value into delreg. loop1 decfsz delreg,1 ; Decrement delreg, test value and skip next if zero. goto loop1 ;--End of time delay. bcf PORTB,7 ; Pull RB7 down after the delay ;--Now hold the RB7 pin down for a further delay period. movlw 0xFF ; This is a redundant instruction - W unchanged! movwf delreg loop2 decfsz delreg,1 goto loop2 goto begin ; if delreg is zero. asm". Note that diﬀerent label names must be used for each delay code block, otherwise an error message will be issued by the assembler.
Getting Started with PIC Microcontrollers by F. Stevens