Hetai MCU digital tube display control program-EEWORLD

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;4-digit common cathode digital tube displays 0123

;Digital tube segment code connection method A-PD0, B-PD1....G-PD6, H-PD7

;Digital tube bit code connection method OM0-PC0...COM4-PC3

;Purpose:

;1. Look up the table

;2. Indirect addressing

include HT66F50.inc

ORG0000H

JMPA1

ORG0020H

Q1:

DC03FH; 0

DC006H; 1

DC05BH; 2

DC04FH; 3

DC066H; 4

DC06DH; 5

DC07DH; 6

DC007H; 7

DC07FH; 8

DC06FH; 9

DC077H; A

DC07CH; B

DC039H; C

DC05EH;D

DC079H; E

DC071H; F

A1:

MOVA,0;Display content

MOV[8AH],A; the first digital tube segment code display content register

MOVA,1;Display content

MOV[8BH],A; The second digital tube segment code display content register

MOVA,2;Display content

MOV[8CH],A; The third digital tube segment code displays the content register

MOVA,3;Display content

MOV[8DH],A; The fourth digital tube display content register

MOVA,08H; select data according to CP1C register setting requirements

MOVCP1C,A; Set the PC port to be the I/0 port instead of the interrupt port

CLRPCC; Set the PC port as the output port

CLRPDC; Set the PD port as output port

MOVA,1; Set the initial display bit code to display the first bit

MOV[80H],A; bit code register

MOVA,8AH; set the corresponding first bit segment code register

MOVMP0,A; indirect register pointer

A2:

CLRPC; Clear PC (clear screen)

MOVA,Q1; data table address
CLR TBHP; clear the high bit of the data table address, otherwise an error will occur

ADDA, IAR0; Use the indirect register to find the address of the data table where the segment code to be displayed is located

MOVTBLP,A; table pointer register TBLP

TABRDPD; Look up the table and store the data in the PD port register

MOVA,[80H]; bit code register

MOVPC,A; store the bit code register value to the PC port register

; The segment code and bit code are both available, so the digital tube is lit

INCMP0; indirect register pointer plus 1 points to the next segment code register

RL[80H]; Left shift code register controls the next digital tube

SNZ[80H].5; Determine whether the 4 digital tubes are controlled

JMPA2; No return to continue

MOVA,1; if yes, reinitialize register data

MOV[80H],A;

MOVA,8AH;

MOVMP0,A;

JMPA1;

END

Here is a Holtek MCU digital tube program for your reference: http://www.51hei.com/mcu/1349.html , with both the circuit diagram and the program.

Reference address：Hetai MCU digital tube display control program

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