int0_f .dt

台湾义隆（EM78P222N）,DATASHEET.

;Defined register(BANK0)
R0        == 0X0
R1        == 0X1
R3        == 0X3
R4        == 0X4 
ISR       == 0XF
;Defined register(BANK1) 
IOC5      == 0X5
IOC6      == 0X6
IOC7      == 0X7
IOC8      == 0X8
COMCON    == 0XA
IMR       == 0XF
;         
          ORG      0X0
          NOP
          JMP      RESET              ;power on reset
          ;
          ORG      0X8
          NOP
          JMP      INT0_F             ;interrupt vector
          ;
INT0_F:
          BANK     0
          BC       ISR, 2             ; Clear INT0IF
          RETI
          ;                 
          ORG      0X50
RESET:
          DISI
          NOP
          CALL     CLEAR_222_SRAM     ;
          NOP
          CALL     INIT_222_DEVICE    ; Initial CHIP    
          NOP
          ENI                         ;Enable interrupt
MAIN:
          NOP
          JMP      $
          ;
INIT_222_DEVICE:
          BANK     1
          MOV      A, @0
          MOV      IOC5, A            ; Set PORT5 as output  
          MOV      IOC6, A            ; Set PORT6 as output        
          MOV      IOC8, A            ; Set PORT8 as output  
          MOV      A, @0X80             
          MOV      IOC7, A            ; Set P7.7 as input
          BS       COMCON, 6          ;SET P77 AS INT0          
          MOV      A, @4
          MOV      IMR, A             ;Enable  EXIE interrupt
          MOV      A, @0XC0           ;
          CONTW
          BANK     0
          CLR      ISR                ;Clear interrupt flag
          RET
          ;
CLEAR_222_SRAM:
          MOV     A, @0X10
          MOV     R4, A             ; Initial SRAM
SRAM_LOOP:
          CLR     R0
          INC     R4
          MOV     A, @0X3F
          AND     A, R4
          JBS     R3, 2
          JMP     SRAM_LOOP
          INC     R1
          BS      R4, 5
          MOV     A, @0X3
          AND     A, R1
          JBS     R3, 2
          JMP     SRAM_LOOP
          RET
          ;          
          END