get_iprate
addwf pcl, f
retlw 1 ; 1:1.
retlw 4 ; 1:4.
retlw 8 ; 1:8.
retlw 16 ; 1:16.
; ----- Get Internal prescaler rate for TMR0. ----------------------------
get_iprtm0
addwf pcl, f
retlw TMR0_1 ; 1:1.
retlw TMR0_4 ; 1:4.
retlw TMR0_8 ; 1:8.
retlw TMR0_16 ; 1:16.
; ----- Get message address of internal prescaler mode. ------------------
get_ipmptr
addwf pcl, f
retlw s_LFmode ; "LF".
retlw s_MFmode ; "MF".
retlw s_MHmode ; "MH".
retlw s_HFmode ; "HF".
; ----- Get decimal point location. --------------------------------------
get_dploc
addwf pcl, f
retlw 3 ; X.XXX kHz.
retlw 5 ; X.XXXXX MHz.
retlw 4 ; X.XXXX MHz.
retlw 3 ; X.XXX MHz.
;-------------------------------------------------------------------------
; Interrupt procedure.
;-------------------------------------------------------------------------
; No interrupt procedure.
;-------------------------------------------------------------------------
; Main procedure.
;-------------------------------------------------------------------------
main
; *** Initialize registers ***
clrf pclath ; Select program memory bank #0.
MOV lw 00000000b ; Disabled all interrupt
MOV wf intcon ; sources.
clrf porta ; Initialize I/O ports.
clrf portb ;
bsf status, rp0 ; Select bank 1.
MOV lw 00101000b ; Pull-up PORTB, T0CS = EXT &
MOV wf option ; set TMR0 rate. (1:1)
MOV lw 00010000b ; Set data directions.
MOV wf trisa ; 1: as input.
MOV lw 00111111b ;
MOV wf trisb ;
bcf status, rp0 ; Select bank 0. (Default)
MOV lw 11110000b ; Set all output ports to ’0’.
andwf porta, f ;
MOV lw 00111111b ;
andwf portb, f ;
; *** Initialize variable ***
clrf CNT+0 ; Clear counter for
clrf CNT+1 ; dummy display.
clrf CNT+2 ;
; *** Initialize LCD ***
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本文关键字：单片机 PIC单片机，单片机-工控设备 - PIC单片机
