LCD display
shows the use of the bitstream visualization module
m_lcdb16.asm
PCB test board for PIC16C84/PIC16F84
with attached dot matrix LCD display on PortB
shows 16 bit binary output on a dot
matrix LCD
Concept
Specifications
Project Resources
Available Microchip PIC
Assembler Source Code
This test application demonstrates the usage of the LCD assembler module file m_lcdb16.asm on a PIC 16F84. This module file is suitable for displaying binary information on a dot matrix LCD. Together with the module file m_lcd.asm, it works with LCD controllers such as Hitachi HD44780 (PDF data sheet, 389 kB), Samsung KS0073 (PDF data sheet, 673 kB), and compatibles.
The program initializes the LCD display to 4 bit transfer mode, clears two 8 bit registers (LO, HI) for the 16 bit counter, and displays every counter step as binary value on the LCD display.
Shows the implementation and functionality of the modules m_wait.asm,
m_lcd.asm, and m_lcdb16.asm on the PIC16F84. For
the Samsung KS0073 controller type, the constant 'LCDTYPE'
must be set to 0x1 to include also the extended function set features
for configuration. If this does not help, see also the FAQ
section concerning LCD communication issues.
|
LCD display |
PCB test board for PIC16C84/PIC16F84 |
| Processor: | Microchip PIC 16F84 |
| Clock Frequency: | 4 MHz crystal (XT mode) |
| Throughput: | 1 MIPS |
| Code Size of entire Program: | approx. 146 instruction words |
| LCD Transmission Mode: | 4 Bit on D4 - D7 (MSB), uses high nibble of the LCD port |
| LCD Connections: | 7 wires (4 Data, 3 Command) |
| Total LCD Connections: | 10 wires (4 Data, 3 Command, 1 Vdd, 1 GND, 1 Contrast) |
| Required Hardware: | HD44780 compatible dot matrix LCD (2x16, 2x20 or 2x40 characters) |
| Main File | HEX Files |
|
Download assembler source code: debug.asm |
Download Hex File: Specifications: |
| The above program needs additional include files (modules) to get successfully assembled: m_bank.asm, m_wait.asm, m_lcd.asm, m_lcdb16.asm | |
Last updated: 05.01.2005