1、设计原理：
??????? NTC热敏电阻为3990K，当温度25摄氏度时对应的阻值为100K。NTC热敏电阻的特性是随着温度升高阻值降低。当温度变化时阻值跟着变化，电压也就跟着变化。S3F9454通过ADC6将检测到的电压值转化为实际的温度值。本例温度检测范围为0~100摄氏度。如需检测其它温度范围可根据实际情况改变电路图中R1的阻值。
2、电路图如下：
3、程序代码如下：
;**************************************************************************
?? ?.include?? ?"S3C9454.reg"
TEMP_AD_COUNTER EQU???? 0CH
NTC_TEMP??????? EQU???? 0FH
NTC_TEMPH?????? EQU???? 10H
NTC_TEMPL?????? EQU???? 11H
CODE_DIS??????? EQU???? 12H??????? ;温度值寄存器
FTS???????????? EQU???? 1EH
TMER??????????? EQU???? 1FH
LED_TEMP3?????? EQU???? 2EH
LED_TEMP1?????? EQU???? 2FH
LED_TEMP2?????? EQU???? 30H
LEDTR1????????? EQU???? 31H
LEDTR2????????? EQU???? 32H
LEDTR3????????? EQU???? 33H
DISP_NUM??????? EQU???? 34H
TEMP_CHANNEL??? EQU???? 67H??????? ;温度检测通道 ADC6
;****************************************************
?? ??? ?ORG?? ?0000H
?? ??? ?VECTOR?? ?00H,?? ?INT_SUB
;****************************************************
INT_SUB:
?? ??? ?TM?? ?T0CON,?? ??? ?#1H
?? ??? ?JR?? ?NZ,?? ??? ?INT_TIMER0
ENDINT:?? ??? ?IRET
;---------------------------------------------------
INT_TIMER0:?? ??? ??? ??? ??? ??? ?; 125us定时中断
?? ??? ?AND?? ?T0CON,?? ??? ?#11110110B
??????????????? INC?? ?TMER
?? ??? ?CP?? ?TMER,?? ???????? #16
?? ??? ?JR?? ?ULT,?? ??? ?ENDTIMER0
?? ??? ?CLR?? ?TMER
?? ??? ?LD?? ?FTS,?? ???????? #1H???????????? ;2MS
ENDTIMER0:
ENDTINT:
?? ??? ?IRET
;******************************************************
??????????????? ORG ?? ?003CH
?? ??? ?DB?? ?00H
?? ??? ?DB?? ?00H
?? ??? ?DB?? ?0C8H?? ??? ??? ??? ?; ENABLE LVR (3.0V)
?? ??? ?DB?? ?03H?? ??? ??? ??? ?; INTERNAL RC 3.2MHz
;******************************************************
??????????????? ORG???? 0100H
RESET:?? ??? ?
??????????????? DI
??????????????? LD????? SP,???????????? #0C0H??????? ;指针地址
??????????????? LD????? CLKCON,???????? #00011000B
??????????????? LD????? BTCON,????????? #10100011B
??????????????? LD????? SYM,??????????? #0
IO_INI:
??????????????? LD????? P0,???????????? #00H
??????????????? LD????? P1,???????????? #00H
??????????????? LD????? P2,???????????? #00H
??????????????? LD????? P0CONH,???????? #11111110B
??????????????? LD????? P0CONL,???????? #10101010B
??????????????? LD????? P0PND,????????? #00000000B
??????????????? LD????? P1CON,????????? #00001010B
??????????????? LD????? P2CONH,???????? #01001010B
??????????????? LD????? P2CONL,???????? #10101010B
??????????????? LD????? P0,???????????? #00H
??????????????? LD????? P1,???????????? #00H
??????????????? LD????? P2,???????????? #0FFH
??????????????? LD????? P0PND,????????? #0H
??????????????? LD????? T0DATA,???????? #51
??????????????? LD????? T0CON,????????? #10001010B
??????????????? LD????? PWMDATA,??????? #0
??????????????? LD????? PWMCON,???????? #0
??????????????? LD????? ADCON,????????? #00000000B
??????????????? EI
??????????????? LD????? R0,???????????? #0
RAM_CLR:?? ???????????????????????????????????????? ;寄存器清零
?? ??? ?CLR?? ?@R0
?? ??? ?INC?? ?R0
?? ??? ?CP?? ?R0,?? ??? ?#0BFH
?? ??? ?JR?? ?ULE,?? ??? ?RAM_CLR
;*****************************************************
;主程序
;*****************************************************
MAINLOOP:????????????????? ?
??????????????? CALL??? ADC_GET
?? ??? ?TM?? ?FTS,??????????? #1
?? ??? ?JR?? ?Z,?? ??? ?MAINLOOP
?? ??? ?CLR???? FTS
?? ??? ?LD?? ?BTCON,?? ??? ?#02H
??????????????? CALL??? DISPLAY
?? ??? ?JR?? ?MAINLOOP
;*****************************************************
;AD采样
;*****************************************************
ADC_GET:
??????????????? INC???? R8
??????????????? CP????? R8,???????????? #250
??????????????? JP????? ULT,??????????? END_ADC_GET
??????????????? CLR???? R8
??????????????? LD????? ADCON,????????? #TEMP_CHANNEL
ADC_GET_1:
??????????????? TM????? ADCON,????????? #8H
??????????????? JR????? Z,????????????? ADC_GET_1
??????????????? ADD???? NTC_TEMPL,????? ADDATAH
??????????????? ADC???? NTC_TEMPH,????? #0
??????????????? INC???? TEMP_AD_COUNTER
??????????????? CP????? TEMP_AD_COUNTER,#16??????????????????? ;16次采样取平均
??????????????? JR????? ULT,??????????? END_ADC_GET
??????????????? CLR???? TEMP_AD_COUNTER
??????????????? RCF
??????????????? RRC???? NTC_TEMPH
??????????????? RRC???? NTC_TEMPL
??????????????? RCF
??????????????? RRC???? NTC_TEMPH
??????????????? RRC???? NTC_TEMPL
??????????????? RCF
??????????????? RRC???? NTC_TEMPH
??????????????? RRC???? NTC_TEMPL
??????????????? RCF
??????????????? RRC???? NTC_TEMPH
??????????????? RRC???? NTC_TEMPL
??????????????? LD????? NTC_TEMP,?????? NTC_TEMPL
??????????????? CLR???? R2
??????????????? LD????? R3,???????????? NTC_TEMP
??????????????? LDC???? R0,???????????? #TAB_TEMP[RR2]????????? ;温度曲线
??????????????? LD????? CODE_DIS,?????? R0
??????????????? CLR???? NTC_TEMPL
??????????????? CLR???? NTC_TEMPH
END_ADC_GET:
?? ??? ?RET
;*********************************************************
;数据管显示
;*********************************************************
DISPLAY:
??????????????? LD????? LEDTR1,???????? #0FFH
??????????????? LD????? LEDTR2,???????? #0FFH
??????????????? LD????? LEDTR3,???????? #0FFH
??????????????? AND???? P0,???????????? #0F8H
??????????????? OR????? P2,???????????? #0FFH
??????????????? LD????? LED_TEMP3,????? CODE_DIS
??????????????? CALL??? DIV_CODE
DISP_LED:
??????????????? INC???? DISP_NUM
??????????????? CP????? DISP_NUM,?????? #4
??????????????? JR????? ULT,??????????? DISP_STEP
??????????????? LD????? DISP_NUM,?????? #1
DISP_STEP:
??????????????? CP????? DISP_NUM,?????? #1
??????????????? JR????? EQ,???????????? DISP_STEP1
??????????????? CP????? DISP_NUM,?????? #2
??????????????? JR????? EQ,???????????? DISP_STEP2
??????????????? CP????? DISP_NUM,?????? #3
??????????????? JR????? EQ,???????????? DISP_STEP3
??????????????? JP????? DISPLAY_END
DISP_STEP1:
??????????????? OR????? P0,???????????? #1H
??????????????? LD????? P2,???????????? LEDTR3????????????? ;个位
??????????????? JP????? DISPLAY_END
DISP_STEP2:
??????????????? OR????? P0,???????????? #2H
??????????????? LD????? P2,???????????? LEDTR2????????????? ;十位
??????????????? JP????? DISPLAY_END
DISP_STEP3:
??????????????? OR????? P0,???????????? #4H
??????????????? LD????? P2,???????????? LEDTR1????????????? ;百位
??????????????? JR????? DISPLAY_END
DISPLAY_END:
?? ??? ?RET
;--------------------------------------------------------------------
DIV_CODE:
??????????????? CLR???? LED_TEMP1
??????????????? CLR???? LED_TEMP2
CALL_TABLED1:
??????????????? CP????? LED_TEMP3,????? #10
??????????????? JR????? ULT,??????????? CALL_TABLED2
??????????????? SUB???? LED_TEMP3,????? #10
??????????????? INC???? LED_TEMP2
??????????????? JR????? CALL_TABLED1
CALL_TABLED2:
??????????????? CP????? LED_TEMP2,????? #10
??????????????? JR????? ULT,??????????? CALL_TABLED3
??????????????? SUB???? LED_TEMP2,????? #10
??????????????? INC???? LED_TEMP1
??????????????? JR????? CALL_TABLED2
CALL_TABLED3:
??????????????? CP????? LED_TEMP1,????? #0
??????????????? JR????? EQ,???????????? CALL_TABLED4
??????????????? AND????? LEDTR1,???????? #4FH
CALL_TABLED4:
??????????????? CLR???? R2
??????????????? LD????? R3,???????????? LED_TEMP2
??????????????? LDC???? R0,???????????? #TAB_LED[RR2]
??????????????? LD????? LEDTR2,???????? R0
??????????????? CLR???? R2
??????????????? LD????? R3,???????????? LED_TEMP3
??????????????? LDC???? R0,???????????? #TAB_LED[RR2]
??????????????? LD????? LEDTR3,???????? R0
??????????????? RET
;******************************************************
;TABLE
;******************************************************
TAB_LED:?????????????????????? ?
??????? DB????? 01H???? ;0
??????? DB????? 4FH???? ;1
??????? DB????? 12H???? ;2
??????? DB????? 06H???? ;3
??????? DB????? 4CH???? ;4
??????? DB????? 24H???? ;5
??????? DB????? 20H???? ;6
??????? DB????? 0FH???? ;7
??????? DB????? 00H???? ;8
??????? DB????? 04H???? ;9
;**************************************
;温度曲线
;**************************************
;???????????? 温度值??? AD值
TAB_TEMP:???????????? ?
??????? DB????? 00????? ;0
??????? DB????? 00????? ;1
??????? DB????? 00????? ;2
??????? DB????? 00????? ;3
??????? DB????? 00????? ;4
??????? DB????? 00????? ;5
??????? DB????? 00????? ;6
??????? DB????? 00????? ;7
??????? DB????? 00????? ;8
??????? DB????? 00????? ;9
??????? DB????? 00????? ;10
??????? DB????? 00????? ;11
??????? DB????? 00????? ;12
??????? DB????? 00????? ;13
??????? DB????? 01????? ;14
??????? DB????? 02????? ;15
??????? DB????? 03????? ;16
??????? DB????? 04????? ;17
??????? DB????? 05????? ;18
??????? DB????? 06????? ;19
??????? DB????? 07????? ;20
??????? DB????? 08????? ;21
??????? DB????? 09????? ;22
??????? DB????? 10????? ;23
??????? DB????? 11????? ;24
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?? ?END