;;;OK ;;;; last modified : 98-3-2,16:00:00 ; ;This example implement a simple ohm-measure with MCU , ;demonstrating how to utilise SX18/28's: ; I/O operation ; ;Hardware: ; Display: 8 segment LCD(working in scaning mode) ; Volatile Resistance: 0--10K ; Immutable Resistance: 10K,series connected with the former ; Standard Resistance: 10K ; Capacitor: 104: 0.01uF ; ; I/O connection: ; ra0--------COM1 ; ra1--------COM2 ; ra2--------COM3 ; ra3--------COM4 ; ; rc0--------LCD.a ; rc1--------LCD.b ; rc2--------LCD.c ; rc3--------LCD.d ; rc4--------LCD.e ; rc5--------LCD.f ; rc6--------LCD.g ; ; rb3--------LCD control ; rb5--------Volatile Resistance ; rb6--------Standard Resistance ; rb7--------Detected Pin ; Configuration data ; The Chip's configuration is 28 pin, 2K EEPROM, 136 byte RAM, ; internal 4MHz internal RC driven, single clock per instruction. ; device pins28,pages4,banks8,osc4mhz,turbo,stackx,optionx RA equ 05h RB equ 06h RC equ 07h PORTA EQU 05H PORTB EQU 06H PORTC EQU 07H INDF EQU 0 TMR0 EQU 1 PCL EQU 2 STATUS EQU 3 FSR EQU 4 RTCC EQU 1H WREG EQU 1H PC EQU 2H C EQU STATUS.0 DC EQU STATUS.1 Z EQU STATUS.2 PD EQU STATUS.3 TO EQU STATUS.4 PA0 EQU STATUS.5 PA1 EQU STATUS.6 PA2 EQU STATUS.7 ;port define common equ ra com1 equ ra.0 com2 equ ra.1 com3 equ ra.2 com4 equ ra.3 lcd_control equ rb.3 lcd_data equ rc ;Varialbes temp equ 10h ;1 byte second equ 0eh minute equ 0fh databyte_1 equ 11h databyte_2 equ 12h databyte_3 equ 13h databyte_4 equ 14h lcd_data_pointer equ 15h lcd_common_pointer equ 16h lcd_phase equ 17h lcd_odd_phase equ 18h time_countl equ 19h time_counth equ 1ah rm_countl equ 1bh rm_counth equ 1ch rc_countl equ 1dh rc_counth equ 1eh ohm_measure_delay equ 1fh dec_l equ 0eh dec_h equ 0fh dec_u equ 23h device pins28,pages4,banks8,osc4mhz,turbo,stackx,optionx reset start org 0 ;jmp InitProg InitProg ; ; inc second ; sb Z ; jmp InitEnd ; jmp Measure1 InitEnd ; reti Measure1 inc databyte_1 mov w,#0fh and databyte_1,w mov w,#3 mov databyte_2,w ; call Measure jmp InitEnd org $40 start mov w,#0 ;rc all out mov !rc,w mov w,#0 ;ra0..3 out mov !ra,w mov w,#%0 ;rb3 out mov !rb,w ; mov w,#0eh ; mov m,w mov w,#0e2h ;1110 0010 mov !option,w ; ^^^PS2 PS1 PS0------1:8 ; ^--------------------PSA=0 prescaler assigned to RTCC ; ^----------------------RTE_ES=0 RTCC L->H ; ^-----------------------RTS=0 RTCC internal inc ; ^------------------------RTE_IE=0 RTCC interrupt is enabled ;^-------------------------RTW=1 register 01h addresses RTCC clr ra clr rb clr rc clr rm_countl clr rm_counth clr rc_countl clr rc_counth call Proc_Init_LCD_Display loop0 mov w,#0 mov ohm_measure_delay,w :loop1 call Display ;1 call Proc_Delay decsz ohm_measure_delay jmp :loop1 call Measure jmp loop0 ret Proc_Delay mov w,#54 ;67;#100;#135;#100;90;#77;#67;#54;#30;#10;#19 mov time_counth,w Proc_Delay_1 mov w,#25;#32 mov time_countl,w ; clr time_countl Proc_Delay_2 decsz time_countl jmp Proc_Delay_2 decsz time_counth jmp Proc_Delay_1 ret proc_read_rtcc mov w,rtcc mov rm_countl,w mov w,#0 mov w,rm_countl-w sb 3.2 ;z=0 inc rm_counth ret Measure call proc_encharge_rm call proc_discharge call proc_bin_bcd call proc_update_display Measure_end ret proc_discharge mov w,#000h ;0000 0000 ; ^---------------------rb.5 input to detecte Cap is discharged ; ^----------------------rb.6 ouput to discharge the Cap ;^-----------------------rb.7 input to disable mov !rb,w :waitdischarge clrb rb.6 clrb rb.5 clrb rb.7 ; snb rb.5 ;jmp :waitdischarge ;call proc_delay ;here will restore the portb status ret ;;;measure the rm value proc_encharge_rm mov w,#60h ;0110 0000 ; ^---------------------rb.5-input -- detecte ; ^----------------------rb.6 input --disable ;^-----------------------rb.7 output--encharge mov !rb,w clr rm_countl clr rm_counth mov w,#80h mov rm_countl,w setb rb.7 ;begin encharge wait_encharge_rm inc rm_countl snb z ;overflow? jmp encharge_rm_1 inc rm_counth snb z ;rm_counth overflow? dec rm_counth mov w,#80h mov rm_countl,w encharge_rm_1 snb rb.5 ;encharged? jmp encharge_rm_end jmp wait_encharge_rm encharge_rm_end mov w,#0f0h sub rm_counth,w mov w,#020h sub rm_counth,w ret proc_bin_bcd mov w,rm_counth clr dec_h mov dec_l,w bin_bcd_1 mov w,#10 mov w,dec_l-w sb 3.0 jmp bin_bcd_end mov dec_l,w inc dec_h jmp bin_bcd_1 bin_bcd_end ; mov w,#9 ; mov w,dec_h-w ; snb 3.0 ; jmp bin_bcd_end_1 ; mov w,#0fh ; mov dec_h,w ; mov dec_l,w bin_bcd_end_1 clrb 3.0 rl dec_h rl dec_h rl dec_h rl dec_h mov w,#0f0h and dec_h,w mov w,#0fh and dec_l,w mov w,dec_l or w,dec_h mov rm_counth,w ; mov w,#099h ; mov w,rm_counth-w ; snb 3.0 ; jmp bin_bcd_end_2 ; mov w,#0ffh ; mov rm_counth,w bin_bcd_end_2 retw 0 ;;;measure the rc value proc_encharge_rc mov w,#0a0h ;1010 0000 ; ^---------------------rb.5 input-- detecte ; ^----------------------rb.6 ouput-- encharge ;^-----------------------rb.7 input-- disable mov !rb,w clr rc_countl clr rc_counth mov w,#080h mov rc_countl,w setb rb.6 ;begin encharge wait_encharge_rc inc rc_countl snb z ;overflow? jmp encharge_rc_1 inc rc_counth mov w,#080h mov rc_countl,w encharge_rc_1 snb rb.6 jmp encharge_rc_end jmp wait_encharge_rc encharge_rc_end ret proc_freq_ohm mov w,#0b0h mov w,rc_counth-w snb 3.0 ;c clr w mov temp,w clrc rr temp mov w,temp mov rc_counth,w ret proc_update_display mov w,rm_counth mov temp,w and w,#0fh mov databyte_1,w mov w,#0f0h and temp,w clrb 3.0 rl temp rl temp rl temp rl temp mov w,temp and w,#0fh mov databyte_2,w ret Proc_Init_LCD_Display ;clear buffer mov w,#$a mov databyte_1,w mov w,#$b mov databyte_2,w mov w,#$c mov databyte_3,w mov w,#$11 mov databyte_4,w clrb rb.3 mov w,#0 mov lcd_data,w mov w,#%1111 mov common,w mov w,#databyte_1 mov lcd_data_pointer,w mov w,#%0001 mov lcd_phase,w mov w,#1 mov lcd_odd_phase,w ret ;LCD SEGMENT CODE TABLE ; org $30 Proc_Seg_Table jmp pc+w retw $3f ;0 retw $06 ;1 retw $5b ;2 retw $4f ;3 retw $66 ;4 retw $6d ;5 retw $7d ;6 retw $07 ;7 retw $7f ;8 retw $6f ;9 retw $77 ;A retw $7c ;b retw $58 ;c retw $5e ;d retw $79 ;E retw $71 ;F retw $76 ;H retw $01 ;1--Com4 retw $02 ;AM retw $04 ;oo retw $08 ;TEMP retw $10 ;PM retw $20 ;TIMER retw $40 ;KEEP WARM Display mov w,lcd_data_pointer mov fsr,w mov w,indf call Proc_Seg_Table sb lcd_odd_phase.0 jmp Display_1 ;2468 not w ;1357 mov rc,w mov w,lcd_phase mov ra,w setb rb.3 jmp Display_2 Display_1 mov rc,w ;2468 mov w,lcd_phase not w and w,#0fh mov ra,w clrb rb.3 inc lcd_data_pointer mov w,#0fh and lcd_phase,w clrb 3.0 ;clear c rl lcd_phase mov w,#databyte_2 mov w,lcd_data_pointer-w sb 3.2 jmp Display_2 mov w,#databyte_1 mov lcd_data_pointer,w mov w,#%0001 mov lcd_phase,w Display_2 inc lcd_odd_phase ret
| file: /Techref/scenix/lcd.src, 7KB, , updated: 1999/6/14 11:14, local time: 2024/4/18 21:32,
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