Single chip advertising light, Advertising Lamp

Single chip advertising light, Advertising Lamp Keywords: AT89S51, advertising light 1. Experimental task Use the method of taking a table to make the port P1 to make a single lamp change: 2 times, right shift 2 times, twinkling 2 times (delayed time 0.2 seconds). 2. Circuit schematic 3. System board hardware connection Connect the P1.0-P1.7 in the "MCU system" area to the L1-L8 port in the "Eight Road Luminous Diode Indicator Module" area, require: P1.0 corresponding to L1, P1.1 Corresponding to L2, ..., P1.7 corresponds to L8. 4. Programming content When designing the form, use the following instructions to complete (1). With the movdptr, # data16's instructions to make the data pointer register to the beginning of the table. (2). With MOVCA, @ A + DPTR instructions, based on the value of the DPTR according to the value of the accumulator, the program counter PC can be made to the data to be taken in the table. Therefore, as long as the control code is built into a table, use MOVCA, @ A + DPTR to make a coded operation, it is convenient to handle some complex control action, and the table process is shown below: 5. Block diagram 6. Assembly source ORG 0 Start: Mov DPTR, # TABLE LOOP: CLR A MOVC A, @ a + dptr CJNE A, # 01h, loop1 JMP START LOOP1: MOV P1, A Mov R3, # 20 LCALL DELAY Inc DPTR JMP loop DELAY: MOV R4, # 20 D1: MOV R5, # 248 DJNZ R5, $ Djnz R4, D1 Djnz R3, DELAY RET Table: DB 0FEH, 0FDH, 0FBH, 0F7H DB 0EFH, 0DFH, 0BFH, 07FH DB 0FEH, 0FDH, 0FBH, 0F7H DB 0EFH, 0DFH, 0BFH, 07FH DB 07FH, 0BFH, 0DFH, 0EFH DB 0F7H, 0FBH, 0FDH, 0FEH DB 07FH, 0BFH, 0DFH, 0EFH DB 0F7H, 0FBH, 0FDH, 0FEH DB 00H, 0FFH, 00h, 0FFH DB 01H End 7. C language source program #include Unsigned char code Table [] = {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xDF, 0xBF, 0x7F, 0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xDF, 0xBF, 0x7F, 0x7F, 0xBF, 0xDF, 0xef, 0xF7, 0xfb, 0xfd, 0xfe, 0x7F, 0xBF, 0xDF, 0xef, 0xF7, 0xfb, 0xfd, 0xfe, 0x00, 0xff, 0x00, 0xff, 0x01}; UNSIGNED Char i; Void delay (void) { Unsigned char M, N, S; FOR (M = 20; M>0; M -) For (n = 20; n>0; n--) For (s = 248; s>0; s -); } Void main (void) { While (1) { IF (Table [i]! = 0x01) { P1 = Table [i]; i ++; DELAY (); } Else { i = 0; } } }, Read the full text

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