1. 4-12 外部中斷
HT66F50

2. 中斷來源
外部中斷
INT0-INT3 PINT’
內部中斷
TM LVD SIM

3. 中斷控制位元 決定中斷是否啟動(enable bit) : ADE INT0E MF1E… 反應中斷是否發生(request flag):
ADF INT0F MF1F

4. 表2-4-2 , HT66F50 11種中斷來源 7個中斷源 (單一周邊) INT0 – 1 Comparator 0-1 A/D
Time Base 0-1
4個複功能中斷源 (13個周邊)
Multi-function 0-3
TM0P-TM3P TM0A-TM3A
TM1B SIM External Peripheral(PINT’)
LVD EEPROM

5. INTC0
CP0F INT1F INT0F CP0E INT1E INT0E EMI
Bit

6. INTEDGE (外部中斷觸發條件) - - - - INT1S1 INT1S0 INT0S1 INT0S0
INT0, INT1 引發中斷 cpu 跳至 004h(int0), 008h(int1)
INT1S1 INT1S0 INT0S1 INT0S0
Bit
INT1S1 INT1S0 (INT1’觸發條件選擇位元)
=00 禁止INT1’ 中斷
=01 正緣觸發
=10 負緣觸發
=11 雙緣觸發
INT0S1 INT0S0 (INT0’觸發條件選擇位元)
=00 禁止INT0’ 中斷

7. 外部中斷
;PROGRAM : 4-12.ASM
;FUNCTION: External INT , 7 SEG 0 – 9 Back to main program
#INCLUDE HT66F50.INC
#INCLUDE 4-12.INC ;
MY_DATA .SECTION 'DATA' ;== DATA SECTION ==
DEL1 DB ?
DEL2 DB ?
DEL3 DB ?
COUNT DB ?
COUNT DB ?
STACK_A DB ? ;STACK BUFFER FOR A
STACK_PSW DB ? ;STACK BUFFER FOR PSW
STACK_DEL1 DB ? ;STACK BUFFER FOR DEL1
STACK_DEL2 DB ? ;STACK BUFFER FOR DEL2
STACK_DEL3 DB ? ;STACK BUFFER FOR DEL3

8. MY_CODE .SECTION AT 0 'CODE' ;== PROGRAM SECTION ==
ORG H ;HT-66XX RESET VECTOR
JMP INIT
ORG 04H ;HT-66RXX ADC INTERRUPT
;VECTOR
JMP ISR_EXTINT0
INIT: CLR ACERL ;Disable ADC input
MOV A,08h ;
MOV CP0C,A ; Disable cp0
MOV CP1C,A ; Disable cp1
CLR SEG_PORT ; turn off 7 SEG
CLR LED_PORT ; turn off LED
CLR SEG_PORTC
CLR LED_PORTC ;CONFIG PA AS OUTPUT
SET PAPU.3 ;ENABLE PA3 pull-up
SET PAC ; CONFIG PA.3 (INT0)as input

9. SET INT0E ;ENABLE external INTERRUPT 0
MOV A, B ;INT0 falling edge trigger (負緣觸發)
MOV INTEG,A
SET INT0E ;ENABLE external INTERRUPT 0
SET EMI ;enable global int (總開關)
MAIN:
MOV A,TAB_7_SEG
MOV TBLP,A ;INITIAL POINTER START ADDRESS
MOV A,10
MOV COUNT,A ;SET DATA COUNT OF TAB_7_SEG
LOOP:
TABRDL SEG_PORT ;READ TABLE AND SEND TO SEG_PORT
MOVE A, ;DELAY 1 sec
CALL DELAY
INC TBLP ;UPDATE TABLE POINTER
SDZ COUNT ;COUNT DOWN BY 1
JMP LOOP ;JUMP IF NOT TABLE END
JMP MAIN ;RESTART

10. ;===========================================================
; EXT INTERRUPT SERVICE ROUTINE
ISR_EXTINT0:
MOV STACK_A,A ;PUSH A
MOV A,STATUS
MOV STACK_PSW,A ;PUSH STATUS
MOV A,DEL1
MOV STACK_DEL1,A ;PUSH DEL1
MOV A,DEL2
MOV STACK_DEL2,A ;PUSH DEL2
MOV A,DEL3
MOV STACK_DEL3,A ;PUSH DEL3
SET LED_PORT ;最右端點亮
MOV A, ;DELAY 10ms
CALL DELAY ;

11. RL LED_PORT ;LED port 左旋 check LED_PORT.7 =1
SNZ LED_PORT ; 續左旋
JMP $-4
MOVE A,10
CALL DELAY
RR LED_PORT ;LED port 右旋 check LED_PORT.0 =1
; 判斷LED 由左至右顯示完畢,若不成立繼左旋
SNZ LED_PORT.7
CLR LED_PORT
MOV A,STACK_DEL ;POP DEL3 [取回進入中斷服務程式時保留數值]
MOV DEL3,A
MOV A,STACK_DEL ;POP DEL2
MOV DEL2,A
MOV A,STACK_DEL ;POP DEL1
MOV DEL1,A
MOV A,STACK_PSW ;POP STATUS
MOV STATUS,A ;POP STATUS
MOV A,STACK_A ;POP A
CLR INT0F
RETI

12. ;===================================================================
; PROC : DELAY
; FUNC : DEALY ABOUT
; PARA : ACC : DELAY FACTOR
; REG : DEL1,DEL2,DEL3
DELAY PROC
MOV DEL1,A ;SET DEL1 COUNTER
DEL_1: MOV A,30
MOV DEL2,A ;SET DEL2 COUNTER
DEL_2: MOV A,110
MOV DEL3,A ;SET DEL3 COUNTER
DEL_3: SDZ DEL ;DEL3 DOWN COUNT
JMP DEL_3
SDZ DEL ;DEL2 DOWN COUNT
JMP DEL_2
SDZ DEL1 ;DEL1 DOWN COUNT
JMP DEL_1
RET
DELAY ENDP

13. ORG LASTPAGE
TAB_7_SEG:
DC 03Fh,006h,05Bh,04Fh,066h;
DC 06Dh,07Dh,007h,07Fh,067h;
END