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4.10 Timer/Event

4.10 Timer/Event. 利用 Timer/Event Counter 之中斷 及 PFD 控制喇叭 4.9 之 Timer 以 Poling 詢問方式檢查 TF 旗標 是否溢位. 外部中斷 計時 / 計數中斷 AD 轉換中斷 I2C Bus 中斷. INTC0 暫存器. - ADF TF EIF EADI ETI EEI EMI Bit 7 6 5 4 3 2 1 0 Bit 7 未使用 Bit 6 ADF

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4.10 Timer/Event

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  1. 4.10 Timer/Event

  2. 利用Timer/Event Counter 之中斷 及PFD 控制喇叭 • 4.9之Timer以Poling詢問方式檢查TF旗標 是否溢位

  3. 外部中斷 • 計時/計數中斷 • AD 轉換中斷 • I2C Bus 中斷

  4. INTC0暫存器 - ADF TF EIF EADI ETI EEI EMI Bit 7 6 5 4 3 2 1 0 • Bit 7 未使用 • Bit 6 ADF 1 AD 轉換完成設定此位元告知CPU 0無 AD 轉換完成之中斷要求

  5. Bit 5 TF 1 計時/計數已溢位 0無計時/計數已溢位之中斷要求 • Bit 4 EIF 計數/計時控制位元 1有外部中斷產生 0 無外部中斷產生 • Bit 3 EADI 計數/計時準位控制位元 1致能AD轉換器轉換完成之中斷 0 禁能AD轉換器之中斷

  6. Bit 2 ETI TMR中斷控制位元 1致能計時/計數溢位之中斷 0 禁能計時/計數溢位之中斷 • Bit 1 EEI 外部中斷控制位元 1致能計時/計數溢位之中斷 0 禁能計時/計數溢位之中斷 • Bit 0 EMI 整體中斷控制位元 1致能 0 禁能所有中斷

  7. EMI為中斷控制樞紐 • EMI=0 不接受中斷 • EMI=1 視EHI EADI ETI EEI 而決定

  8. 要產生F Hz方波:需計數時間 T=1/2F • 換成計數脈波=T/((1/fsys) x 計數倍率) • 化簡後= fsys / (F x 2 x 計數倍率) • TMRH, TMRL 之起始值 65536-(fsys / (F x 2 x 計數倍率))

  9. 65280≦{65536-(fsys / (F x 2 x 計數倍率))} ≦ 65535 • TMRH=FFH • 選用預除比率1:16 256-(fsys / (F x 2 x 16))

  10. ;PROGRAM : 4-10.ASM ;FUNCTION: GENERATE TONE DO~DO. BY TMR INTERRUPT SKILL ;NOTE : USING TMR AS A 8-BIT TIMER #INCLUDE HT46R23.INC .CHIP HT46R23 ;------------------------------------------------------------ MY_DATA .SECTION 'DATA' ;== DATA SECTION == DEL1 DB ? ;DELAY LOOP COUNT 1 DEL2 DB ? ;DELAY LOOP COUNT 2 DEL3 DB ? ;DELAY LOOP COUNT 3 COUNT DB ? ;PITCH COUNT STACK_A DB ? ;STACK BUFFER FOR ACC STACK_PSW DB ? ;STACK BUFFER FPR PSW

  11. ;--------------------------------------------------------------------;-------------------------------------------------------------------- OSC EQU 4000000 ;fSYS=4 MHz ;-------------------------------------------------------------------- SPK_PORT EQU PA ;DEFINE SPEAKER PORT SPK_PORTC EQU PAC.0 ;DEFINE SPEAKER PORT CON. REG. MY_CODE .SECTION AT 0 'CODE' ;== PROGRAM SECTION == ORG 00H ;HT-46RXX RESET VECTOR JMP START_ ORG 08H ;HT-46RXX TMR INTERRUPT VECTOR JMP TMR_INT START_: CLR SPK_PORTC ;CONFIG SPK_PORT AS OUTPUT MODE MOV A,00000101B ;ENABLE GLOBAL AND TMR INTERRUPT MOV INTC0,A MOV A,10000100B ;CONFIG TMR 0 IN MODE 2(TIMER MODE) MOV TMRC,A ;fINT=fSYS/16(4MHz/16).

  12. MAIN: MOV A,TAB_PITCH MOV TBLP,A ;INITIAL TABLE POINTER MOV A,15 MOV COUNT,A ;SET COUNTER FOR PITCH TABLE NEXT_PITCH: TABRDL TMRL ;LOAD PITCH TO TMR PE-LOAD REGISTER MOV A,0FFH MOV TMRH,A ;PRELOAD TMRH=FFH FOR 8-BIT TMR SET TON ;START TMR COUNTING MOV A,40 ;DELAY 0.4 SEC FOR EACH TONE MOV DEL1,A CALL DELAY CLR TON ;STOP TMR COUNTING INC TBLP ;UPDATE TABLE POINTER SDZ COUNT ;WERE ALL PITCH PLAYED? JMP NEXT_PITCH ;NO, NEXT PITCH JMP MAIN

  13. ;********************************************************************;******************************************************************** ; TIMER INTERRUPT SERVICE ROUTINE ;******************************************************************** TMR_INT : MOV STACK_A,A ;PUSH A MOV A,STATUS MOV STACK_PSW,A ;PUSH STATUS MOV A,00000001B XORM A,SPK_PORT ;COMPLEMENT PA.0 MOV A,STACK_PSW MOV STATUS,A ;POP STATUS MOV A,STACK_A ;POP A RETI

  14. ;********************************************************************;******************************************************************** ; Delay about DEL1*10mS ;******************************************************************** DELAY PROC MOV A,30 MOV DEL2,A ;SET DEL2 COUNTER DEL_2: MOV A,110 MOV DEL3,A ;SET DEL3 COUNTER DEL_3: SDZ DEL3 ;DEL3 DOWN COUNT JMP DEL_3 SDZ DEL2 ;DEL2 DOWN COUNT JMP DEL_2 SDZ DEL1 ;DEL1 DOWN COUNT JMP DELAY RET DELAY ENDP ORG LASTPAGE

  15. TAB_PITCH: ;PITCH CONSTANT FOR fINT=fSYS/16 DC 256-OSC/(523*2*16) ;DO TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(587*2*16) ;RE TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(659*2*16) ;MI TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(698*2*16) ;FA TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(785*2*16) ;SO TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(880*2*16) ;LA TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(998*2*16) ;TI TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(523*2*16*2) ;DO. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(587*2*16*2) ;RE. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(659*2*16*2) ;ME. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(698*2*16*2) ;FA. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(785*2*16*2) ;SO. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(880*2*16*2) ;LA. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(998*2*16*2) ;TI. TONE TIME CONSTANT (LO-BYTE) DC 256-OSC/(523*2*16*4) ;DO. TONE TIME CONSTANT (LO-BYTE) END

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