1、;lab5_asm;vol1.0;zqy;2012/2/18;定義初始化LED_CHABITPSW數(shù)碼管顯示標志位，為1顯示十位，為0顯示個位;數(shù)字0-9ORG00HJMPSTARTORG000BHJMPINT_T0$到中斷服務(wù)程序，更改數(shù)碼管顯示ORG0100HLED_TAB1:DB0BFH,86H,0DBH,0CFH,0E6H,0EDHDB0FDH,87H,0FFH,0EFH,0BFHDB86H,0DBH,0CFH,0E6H,0EDH,0FDHLED_TAB2:DB0BFH,0BFH,0BFH,0BFH,0BFHDB0BFH,0BFH,0BFH,0BFH,0BFHDB86H,86H,86H

2、,86HDB86H,86H,86HSTART:;工作寄存器和某些數(shù)據(jù)單元的初始化MOVR0,#0;數(shù)碼管顯示初始化SETBLED_CHAMOVDPTR,#8300H&選地址賦給DPTR高八位P2口，選中U13鎖存器MOVA,#0FEH&選數(shù)據(jù)，選中個位數(shù)碼管，置低為選中MOVXDPTR,陣選數(shù)據(jù)，對片外I/O口的外設(shè)芯片訪問MOVDPTR,#82001H選地址MOVA,#0BFH段選數(shù)據(jù)，個位顯示0MOVXDPTR,A;定時器初始化MOVIE,#82H開啟定時器T0中斷MOVTMOD,#01H設(shè)定定時器T0為模式1MOVTH0,#0D8HMOVTL0,#0F0H；l入初值，10

3、MS延時12MHzSETBTR隔動定時器T0KEY:;按鍵處理LCALLKEY_STARTB判斷有無鍵按下子程序JZKEYB鍵按下，重新掃描LCALLKEY_DEL密健按下，延時去抖LCALLKEY_STARTJZKEYLCALLKEY_NEXT斷哪一個鍵被按下LCALLDECODE值譯碼LCALLKEY_END;斷按鍵釋放LJMPKEYKEY_START:MOVDPTR,#8000Ht盤地址MOVA,#0F0HMOVXDPTR,A全部輸出0NOPNOPNOPMOVXA,DPTR3描鍵盤CPL硼正邏輯，1為按下ANLA,#0FHRETKEY_NEXT:MOVR1,#0掃描行計數(shù)器MOVR2,#

4、0掃描列計數(shù)器MOVR3,#0FEHt行掃才苗字送R3MOVDPTR,#8000HMOVA,R3MOVXDPTR,AMOVXA,DPTRCPLAANLA,#0FHMOVR4,#4S0123:JNZSKEY0;為全0,有鍵按下;全為0，進行下一行掃描INCR1行計數(shù)器加1MOVA,R3RLAMOVR3,AMOVDPTR,#8000HMOVXDPTR,ANOPNOPNOPMOVXA,DPTRCPLAANLA,#0FHDJNZR4,S0123LJMPKEYEKEY:RETSKEY0列號譯碼JBACC.0,SKEY1JBACC.1,SKEY2JBACC.2,SKEY3JBACC.3,SKEY4SKEY

5、1:MOVA,#00H；歹U號0MOVR2,AAJMPEKEYSKEY2:MOVA,#01H；歹U號1MOVR2,AAJMPEKEYSKEY3:MOVA,#02H；歹U號2MOVR2,AAJMPEKEYSKEY4:MOVA,#03H；歹ij號3MOVR2,AAJMPEKEYDECODE:;行號在R1,列號在R2;鍵值譯碼MOVA,R1MOVB,#04HMULABADDA,R2INCAMOVR0,ARETKEY_END:MOVDPTR,#8000雎盤地址MOVXA,DPTR3描鍵盤CPL硼正邏輯，1為按下ANLA,#0FHJNZKEY_ENDLCALLKEY_DELAYJNZKEY_ENDRET

6、KEY_DELAY:MOVR5,#10HDS1:MOVR6,#0FFHDS2:NOPDJNZR6,DS2DJNZR5,DS1RETINT_T0:;中斷服務(wù)程序，更改數(shù)碼管顯示MOVR7,AJBLED_CHA,DISP拴查數(shù)碼管顯示標志位CPLLED_CHAMOVDPTR,#8200H|S選地址MOVA,#0MOVXDPTR,AMOVDPTR,#8300H&選地址賦給DPTR高八位P2口，選中U13鎖存器MOVA,#0FEH&選數(shù)據(jù)，選中個位數(shù)碼管，置低為選中MOVXDPTR,陣選數(shù)據(jù)，對片外I/O口的外設(shè)芯片訪問;判斷需要顯示的個位數(shù)字MOVA,R0NOPMOVDPTR,#LED_TAB1NOPNOPMOVCA,A+DPTRMOVDPTR,#8200H|S選地址MOVXDPTR,AJMPINT_EXITDISP_L:CPLLED_CHAMOVDPTR,#8200H|S選地址MOVA,#0MOVXDPTR,AMOVDPTR,#8300H選地址賦給DPTR高八位P2口，選中U13鎖存器MOVA,#0FDHi選數(shù)據(jù)，選中十位數(shù)碼管，置低為選中MOVXDPTR,陣選數(shù)據(jù)，對片外I/O口的外設(shè)芯片訪問;判斷需要顯示的十位數(shù)字0或1MOVA,R0NOPMOVDPTR,#LED_TAB2MOVCA,A+DPTRMOVDPTR,#8200H