MIKROE-455 mikroElektronika, MIKROE-455 Datasheet - Page 15

• 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
10.0. Push Buttons
The logic state of all microcontroller digital inputs may be changed using the push buttons. Jumper J6 is used to determine the logic
state to be applied to the desired microcontroller pin by pressing the appropriate push button. The purpose of the protective resistor
is to limit the maximum current, thus preventing a short circuit from occurring. If needed, advanced users may shorten such resistor
using jumper J9. Right next to the push buttons, there is a RESET button which is not connected to the mRST pin. The reset signal is
generated by the programmer.
Pressure on any push button, when jumper J6 is in the VCC position, will cause a logic one (5V) to be applied to appropriate
microcontroller pin as shown in Figure 10-2.
Figure 10-2: Push buttons and port PORT0 connection schematic
Jumper J6 in the VCC position
Jumper J9 used for shorten-
ing the protective resistor
Jumper J6 used for se-
lecting logic state to be
applied to the pin by
pressing a button
Push buttons used for
digital inputs simulation
RESET button
Figure 10-1: Push buttons
MikroElektronika
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