;;;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 10:14, local time: 2024/11/15 21:56,
3.22.241.15:LOG IN
|
| ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://massmind.ecomorder.com/techref/scenix/lcd.src"> scenix lcd</A> |
| Did you find what you needed? |
Welcome to ecomorder.com! |
Welcome to massmind.ecomorder.com! |
.