MIKROE-415 mikroElektronika, MIKROE-415 Datasheet - Page 24

• Manufacturer Part Number: MIKROE-415
• Description: Development Boards & Kits - AVR EASYAVR6 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-415

• Tool Type: AVR Development Board
• Interface Type: RS-232, USB, JTAG UART
• Dimensions: 265 mm x 220 mm
• Operating Supply Voltage: 9 V to 32 V
• Lead Free Status / Rohs Status: Details

24
MikroElektronika
Pull-up/pull-down resistors enable you to set the logic level on all microcontroller input pins when they are in idle state. Such level
depends on the position of the pull-up/pull-down jumper. The PA0 pin with the relevant DIP switch SW1, jumper J1 and PA0 push
button with jumper J13 are used here for the purpose of explaining the performance of pull-up/pull-down resistors. The principle of
their operation is identical for all the microcontroller pins.
Figure 19-5: Jumper J1 in pull-down and J13 in pull-up position
Figure 19-6: Jumper J1 in pull-up and J13 in pull-down position
Figure 19-7: Jumpers J1 and J13 in the same position
VCC
VCC
DIP40
DIP40
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
RESET
VCC
GND
XTAL2
XTAL1
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
RESET
VCC
GND
XTAL2
XTAL1
PD0
PD1
PD2
PD3
PD4
PD5
PD6
down
pull
up
VCC
J1
AVCC
AVCC
AREF
AREF
GND
GND
PC7
PC6
PC5
PC4
PC3
PC2
PC0
PD7
PC7
PC6
PC5
PC4
PC3
PC2
PC0
PD7
PA5
PA5
PA0
PA2
PA3
PA4
PA6
PA7
PC1
PA0
PA2
PA3
PA4
PA6
PA7
PC1
PA1
PA1
VCC
J13
VCC
VCC
down
down
pull
pull
up
up
VCC
VCC
0V
5V
J1
J1
0V
0V
5V
5V
RN1
SW1
RN1
SW1
PA0
PA0
J18
J18
8x10K
8x10K
R58
220R
R58
220R
VCC
VCC
J13
J13
In order to enable the port PORTA pins to be
connected to the pull-down resistors, fi rst it is
necessary to set jumper J1 in the Down position.
This enables any port PORTA pin to be provided with
a logic zero (0V) in idle state over jumper J1 and
8x10K resistor network. To provide the PA0 pin with
such signal, it is necessary to set switch PA0 on the
DIP switch SW1 in the ON position.
As a result, every time you press the PA0 push
button, a logic one (1) will appear on the PA0 pin,
provided that jumper J13 is set in the VCC position.
In order to enable port PORTA pins to be connected
to pull-up resistors and the port input pins to be
acivated with logic zero (0), it is necessary to set
jumper J1 in the Up position (5V) and jumper J13
in the GND position (0V). Also, the PA0 pin on the
DIP switch SW1 should be set in the ON position so
as to enable all port PORTA input pins, over the 10k
resistor, to be provided with logic one (5V) in their
idle state. The PA0 switch supplies the PA0 pin with
this voltage over the 10k resistor.
As a result, every time you press the PA0 push
button, a logic zero (0) will appear on the PA0 pin.
In case that jumpers J1 and J13 have the same logic
state, pressure on any button will not cause input
pins to change their logic state.
EasyAVR6 Development System
EasyAVR6 Development System