The 8051 Micro
The 8051 Microcontroller

US$82.00

The 8051 Micro: Architecture, Programming & Applications
The 8051 Microcontroller : Architecture, Programming, and Applications

US$29.95

C and the 8051:
Building Efficient Applications








C & the 8051: Building Efficient Applications

US$65.00

C 
 and the 8051 : Hardware, Modular Programming, and Multitasking








C and the 8051: Hardware, Modular Programming, and Multitasking

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uP & uC Fundamentals










uP & uC Fundamentals: The 8085/8051 Hardware and Software
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Programming and
 Customizing the 8051 Microcontroller








Programming and Customizing the 8051 Microcontroller
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APPLICATION #3     5x7 MATRIX LED INTERFACE

Since we can source a maximum of 20mA per pin for PORT P1 and total maximum current from PORT P1 is 80mA, hence we can use PORT P1 to drive Matrix LED directly. Below circuit shows one Common Cathode 5 x 7 Matrix LEDs is connected to Port P1 with 120 Ohms current limiting resistors. The Columns are activated by Q1, Q2, Q3, Q4 and Q5 respectively by logic high at P3.0, P3.1, P3.2, P3.3, P3.4 which switch on gnd to the respective common cathode pins.

 Low Cost C Compiler ?     8051 ANSI C from SPJ, India ~ US$274.95  

1) For SPJ 8051 C, the following code, mat2051_c
2) For KEIL 8051 C, the following code, matc_89.c
demonstrate how to drive a 5 x 7- Matrix LED. The program first display one 5 x 7 pattern on the LEDs and then redisplay this pattern over and over again.

EXERCISES

Modify the above program to display your name on the display, flashing each Alphabet for one second and then flashing the next alhabet until all the alphabet in your name has been shown and repeat this sequence all over again.

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