΢»úÔ­ÀíʵÑ鱨¸æ ÏÂÔØ±¾ÎÄ

²¦¶¯8¸ö¿ª¹ØÊ¹Ö®´¦ÓÚÒ»¶¨µÄλÖÃ״̬£¬È»ºóÔËÐгÌÐò£¬Ôò8¸öLEDµÄÁÁÃðÄܹ»Õýȷָʾ8¸ö¿ª¹ØµÄλÖÃ״̬¡£

È磺¿ª¹Ø×´Ì¬£º10101001(1±íʾºÏ£¬0±íʾ¿ª) Ôò LEDµÆ×´Ì¬£º10101001(1±íʾÁÁ£¬0±íʾÃð)

2. Á÷Ë®µÆÏÔʾʵÑé

ʹ8255µÄA¿ÚºÍB¿Ú¾ùΪÊä³ö£¬Êý¾ÝµÆD7¡«D0 ÓÉ×óÏòÓÒ£¬Ã¿´Î½öÁÁÒ»¸öµÆ£¬Ñ­»·ÏÔʾ£¬D15¡«

D8 ÓëD7¡«D0ÕýÏà·´£¬ÓÉÓÒÏò×ó£¬Ã¿´Î½öµãÁÁÒ»¸öµÆ£¬Ñ­»·ÏÔʾ¡£ÊµÑé½ÓÏßͼÈçͼ2-6-5Ëùʾ¡£ÊµÑé Ò»£º²½ÖèÈçÏÂËùÊö£º

£¨1£©°´Í¼2-6-5Á¬½ÓʵÑéÏß·ͼ£»

£¨2£©±àдʵÑé³ÌÐò£¬¾­±àÒë¡¢Á´½ÓÎÞÎóºó×°Èëϵͳ£» £¨3£©ÔËÐгÌÐò£¬¹Û²ìLED µÆµÄÏÔʾ£¬ÑéÖ¤³ÌÐò¹¦ÄÜ£» £¨4£©×Ô¼º¸Ä±äÁ÷Ë®µÆµÄ·½Ê½£¬±àд³ÌÐò¡£ ¶þ£ºÊµÑé¹ý³Ì£º 1 ʵÑéÏß·ͼ

ͼ2-6-5 8255Á÷Ë®µÆÊµÑé½ÓÏßͼ

2 ³ÌÐòÈçÏ£º

========================================================= ; ÎļþÃû: A82552.ASM

; ¹¦ÄÜÃèÊö: A¿ÚΪÊä³ö£¬B¿ÚΪÊä³ö£¬Á÷Ë®µÆÏÔʾ

;========================================================= SSTACK

SEGMENT STACK

DW 32 DUP(?)

ENDS

SSTACK

CODE SEGMENT

ASSUME CS:CODE

START: MOV DX, 0646H

MOV AL, 80H £»ÉèÖóõʼ»¯·½Ê½¿ØÖÆ×Ö OUT DX, AL MOV BX, 8001H MOV DX, 0640H MOV AL, BH

OUT DX, AL £»´ÓA¿ÚÊä³ö¿ØÖÆ×´Ì¬

ROR BH, 1 £»Ñ­»·ÓÒÒÆ£¬¿ØÖƵƴÓ×óÏòÓÒÁ÷Ë®ÏÔʾ

MOV DX, 0642H MOV AL, BL

OUT DX, AL £»´ÓB¿ÚÊä³ö¿ØÖÆ×´Ì¬

ROL BL, 1 £»Ñ­»·×óÒÆ£¬¿ØÖƵƴÓÓÒÏò×óÁ÷Ë®ÏÔʾ

CALL DELAY CALL DELAY

JMP AA1 £»ÎÞÌõ¼þ×ªÒÆ

AA1:

DELAY: PUSH CX

MOV CX, 0F000H PUSH AX POP AX LOOP AA2 POP CX RET

AA2:

CODE ENDS

END START

ʵÑé½á¹û£º

D0~D7ºÍD8~D15´ÓÖмäÏòÁ½±ßÒÀ´ÎÑ­»·ÏÔʾ£¬¼´´ÓD7¡¢D8¿ªÊ¼·Ö±ðÏòÁ½±ß

µ½D0¡¢D15£¬ÒÀ´ÎÑ­»·ÏÔʾ¡£

ʵÑé¶þ£º8251 ´®ÐнӿÚÓ¦ÓÃʵÑé

1 ʵÑéÄ¿µÄ

1. ÕÆÎÕ8251 µÄ¹¤×÷·½Ê½¼°Ó¦Óã» 2. Á˽âÓйش®¿ÚͨѶµÄ֪ʶ¡£

2 ʵÑéÉ豸

PC»úÁ½Ì¨£¬TD-PITE ʵÑé×°ÖÃÁ½Ìס£

3 ʵÑéÄÚÈÝ

1. Êý¾ÝÐźŵĴ®Ðд«ÊäʵÑ飬ѭ»·Ïò´®¿Ú·¢ËÍÒ»¸öÊý£¬Ê¹ÓÃʾ²¨Æ÷²âÁ¿TXD Òý½ÅÉϵIJ¨ÐΣ¬ÒÔÁ˽⴮Ðд«ÊäµÄÊý¾Ý¸ñʽ¡£ 2. ×ÔÊÕ×Ô·¢ÊµÑ飬½«3000H ÆðʼµÄ10 ¸öµ¥ÔªÖеijõʼÊý¾Ý·¢Ë͵½´®¿Ú£¬È»ºó×Ô½ÓÊÕ²¢±£´æµ½4000H ÆðʼµÄÄÚ´æµ¥ÔªÖС£

3. Ë«»úͨѶʵÑ飬±¾ÊµÑéÐèÒªÁ½Ì¨ÊµÑé×°Öã¬ÆäÖÐһ̨×÷Ϊ½ÓÊÕ»ú£¬Ò»Ì¨×÷Ϊ·¢ËÍ»ú£¬·¢ËÍ»ú½«3000H¡«3009H ÄÚ´æµ¥ÔªÖй²10 ¸öÊý·¢Ë͵½½ÓÊÕ»ú£¬½ÓÊÕ»ú½«½ÓÊÕµ½µÄÊý¾ÝÖ±½ÓÔÚÆÁÄ»ÉÏÊä³öÏÔʾ¡£

4 ʵÑéÔ­Àí

1. 8251 µÄ»ù±¾ÐÔÄÜ

8251 Êǿɱà³ÌµÄ´®ÐÐͨÐŽӿڣ¬¿ÉÒÔ¹ÜÀíÐźű仯·¶Î§ºÜ´óµÄ´®ÐÐÊý¾ÝͨÐÅ¡£ÓÐÏÂÁлù±¾ÐÔÄÜ£º

£¨1£©Í¨¹ý±à³Ì£¬¿ÉÒÔ¹¤×÷ÔÚͬ²½·½Ê½£¬Ò²¿ÉÒÔ¹¤×÷ÔÚÒì²½·½Ê½£»

£¨2£©Í¬²½·½Ê½Ï£¬²¨ÌØÂÊΪ0¡«64K£¬Òì²½·½Ê½Ï£¬²¨ÌØÂÊΪ0¡«19.2K£»

£¨3£©ÔÚͬ²½·½Ê½Ê±£¬¿ÉÒÔÓÃ5¡«8λÀ´´ú±í×Ö·û£¬ÄÚ²¿»òÍⲿͬ²½£¬¿É×Ô¶¯²åÈëͬ²½×Ö·û£» £¨4£©ÔÚÒì²½·½Ê½Ê±£¬Ò²Ê¹ÓÃ5¡«8λÀ´´ú±í×Ö·û£¬×Ô¶¯ÎªÃ¿¸öÊý¾ÝÔö¼Ó1¸öÆô¶¯Î»£¬²¢Äܹ»¸ù¾Ý±à³ÌΪÿ¸öÊý¾ÝÔö¼Ó1 ¸ö¡¢1.5 ¸ö»ò2 ¸öֹͣλ£» £¨5£©¾ßÓÐÆæÅ¼¡¢Òç³öºÍÖ¡´íÎó¼ì²âÄÜÁ¦£» £¨6£©È«Ë«¹¤£¬Ë«»º³åÆ÷·¢ËͺͽÓÊÕÆ÷¡£ ×¢Ò⣬8251 ¾¡¹Üͨ¹ýÁËRS-232 ¹æ¶¨µÄ»ù±¾¿ØÖÆÐźţ¬µ«²¢Ã»ÓÐÌṩ¹æ¶¨µÄÈ«²¿Ðźš£

2. 8251µÄÄÚ²¿½á¹¹¼°ÍⲿÒý½Å

8251 µÄÄÚ²¿½á¹¹Í¼Èçͼ2-7-1Ëùʾ£¬¿ÉÒÔ¿´³ö£¬8251ÓÐ7 ¸öÖ÷Òª²¿·Ö£¬¼´Êý¾Ý×ÜÏß»º³åÆ÷¡¢¶Á/д¿ØÖÆÂß¼­µç·¡¢µ÷ÖÆ/½âµ÷¿ØÖƵç·¡¢·¢ËÍ»º³åÆ÷¡¢·¢ËÍ¿ØÖƵç·¡¢½ÓÊÕ»º³åÆ÷ºÍ½ÓÊÕ¿ØÖƵç·£¬Í¼Öл¹±êʶ³öÁËÿ¸ö²¿·Ö¶ÔÍâµÄÒý½Å¡£

8251 µÄÍⲿÒý½ÅÈçͼ2-7-2Ëùʾ£¬¹²28 ¸öÒý½Å£¬Ã¿¸öÒý½ÅÐźŵÄÊäÈëÊä³ö·½Ê½ÈçͼÖеļýÍ··½ÏòËùʾ¡£

ͼ2-7-1 8251ÄÚ²¿½á¹¹Í¼

ͼ2-7-2 8251ÍⲿÒý½Åͼ

3. 8251 ÔÚÒì²½·½Ê½ÏµÄTXD ÐźÅÉϵÄÊý¾Ý´«Êä¸ñʽ

ͼ3-7-3 ʾÒâÁË8251 ¹¤×÷ÔÚÒì²½·½Ê½ÏµÄTXD ÐźÅÉϵÄÊý¾Ý´«Êä¸ñʽ¡£Êý¾ÝλÓëֹͣλµÄλÊý¿ÉÒÔÓɱà³ÌÖ¸¶¨¡£

ͼ2-7-3 8251¹¤×÷ÔÚÒì²½·½Ê½ÏÂTXDÐźŵÄÊý¾Ý´«Êä¸ñʽ

4. 8251µÄ±à³Ì

¶Ô8251 µÄ±à³Ì¾ÍÊǶÔ8251 µÄ¼Ä´æÆ÷µÄ²Ù×÷£¬ÏÂÃæ·Ö±ð¸ø³ö8251 µÄ¼¸¸ö¼Ä´æÆ÷µÄ¸ñʽ¡£

£¨1£©·½Ê½¿ØÖÆ×Ö

·½Ê½¿ØÖÆ×ÖÓÃÀ´Ö¸¶¨Í¨ÐÅ·½Ê½¼°Æä·½Ê½ÏµÄÊý¾Ý¸ñʽ£¬¾ßÌå¸÷λµÄ¶¨ÒåÈçͼ