MIKROE-455 mikroElektronika, MIKROE-455 Datasheet - Page 17

• Manufacturer Part Number: MIKROE-455
• Description: Development Boards & Kits - 8051 EASY8051 V6 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-455

• Rohs: yes
• Product: Development Kits
• Tool Is For Evaluation Of: AT89S8253
• Core: 8051
• Interface Type: CAN, MMC/SD, RS-232, USB
• Operating Supply Voltage: 5 V, 9 V to 32 V
• Data Bus Width: 8 bit
• Description/function: Development Board Only, GLCD, LCD, DS1820, Serial Cable not included
• Dimensions: 265 mm x 220 mm
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• For Use With: AT89S8253

Easy8051 v6 Development System
12.0. 4x4 Keypad
The 4x4 keypad is a standard alphanumeric keypad connected to the microcontroller PORT0. The operation of such keypad is based on
to one of input pins. It is determined which of the push buttons is pressed from within the software. For example, by pressing button 6, a
logic one (1) will appear on the P0.5 pin. After that, by applying a logic one (1) to each of the following output pins P0.0, P0.1, P0.2 and
P0.3 it is possible to determine which of the push buttons is pressed.
Jumper J1 is in the GND
position. Pins P0.4, P0.5, P0.6
and P0.7 are connected to
pull-down resistors via DIP
switch SW1.
4x4 keypad and microcontroller connection schematic
4x4 keypad
4x4 keypad performance
MikroElektronika
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