Mikroelektronika MikroE Development Kits MIKROE-703 Datenbogen
Produktcode
MIKROE-703
22
UNI-DS6
MikroElektronika
page
VCC-BRD
J1 SW1
RN1
8x10K
R58
220
VCC-BRD
J13
J12
RA0
RA0
VCC-BRD
0V
up
pull
down
RA4
RE4
RE2
RA12
RB4
RF12
RB12
RG4
RC4
RG12
RC12
RH4
RD4
RJ4
RD12
USB-VBUS
RA6
RA14
RF6
RB6
RF14
RB14
RG6
RC6
RG14
RC14
RH6
RD6
RJ6
RD14
#RX232A
#TX232A
#SCL
#SDA
#SS1#
#SCK1
#MISO1
#MOSI1
USB-DP
RA0
RE0
RA8
RF0
RE6
RB0
RF8
RB8
RG0
RC0
RG8
RC8
RH0
RD0
RJ0
RD8
RA2
RA10
RF2
RF4
RB2
RF10
RB10
RG2
RC2
RG10
RC10
RH2
RD2
RJ2
RD10
RA5
RA13
RB5
RF13
RB13
RG5
RC5
RG13
RC13
RH5
RD5
RJ5
RD13
RA7
RA15
RF7
RF5
RF3
RB7
RF15
RB15
RG7
RC7
RG15
RC15
RH7
RD7
RJ7
RD15
#RX232B
#TX232B
#CS1#
#CS2#
#SS2#
#SCK2
#MISO2
#MOSI2
USB-DN
RA1
RE1
RA9
RF1
RE7
RE5
RE3
RB1
RF9
RB9
RG1
RC1
RG9
RC9
RH1
RD1
RJ1
RD9
RA3
RA11
RB3
RF11
RB11
RG3
RC3
RG11
RC11
RH3
RD3
RJ3
RD11
VCC-SW
VCC-5V
CN20
CN21
Pull-up/pull-down resistors enable you to feed all microcontroller’s input pins with logic level when they are in idle state�
This level depends on the position of the pull-up/pull-down jumper (J1-J11)� The RA0 pin with the relevant jumper J1
and RA0 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 the same for all other microcontroller pins�
In order to enable the PORTA pins to be
connected to pull-down resistors, it is necessary
to place jumper J1 in the Down position first.
This enables any PORTA port pin to be supplied
with a logic zero (0V) in idle state over jumper
J1 and 8x10k resistor network� To provide the
RA0 pin with this signal, it is necessary to set
switch 1 on the DIP switch SW1 to the ON
position�
As a result, every time you press the RA0 push
button, the RA0 pin will be fed with a logic one
(VCC-BRD voltage), provided that jumper J13
is placed in the VCC-BRD position�
VCC-BRD
J1 SW1
RN1
8x10K
R58
220
VCC-BRD
J13
J12
RA0
RA0
VCC-BRD
0V
up
pull
down
RA4
RE4
RE2
RA12
RB4
RF12
RB12
RG4
RC4
RG12
RC12
RH4
RD4
RJ4
RD12
USB-VBUS
RA6
RA14
RF6
RB6
RF14
RB14
RG6
RC6
RG14
RC14
RH6
RD6
RJ6
RD14
#RX232A
#TX232A
#SCL
#SDA
#SS1#
#SCK1
#MISO1
#MOSI1
USB-DP
RA0
RE0
RA8
RF0
RE6
RB0
RF8
RB8
RG0
RC0
RG8
RC8
RH0
RD0
RJ0
RD8
RA2
RA10
RF2
RF4
RB2
RF10
RB10
RG2
RC2
RG10
RC10
RH2
RD2
RJ2
RD10
RA5
RA13
RB5
RF13
RB13
RG5
RC5
RG13
RC13
RH5
RD5
RJ5
RD13
RA7
RA15
RF7
RF5
RF3
RB7
RF15
RB15
RG7
RC7
RG15
RC15
RH7
RD7
RJ7
RD15
#RX232B
#TX232B
#CS1#
#CS2#
#SS2#
#SCK2
#MISO2
#MOSI2
USB-DN
RA1
RE1
RA9
RF1
RE7
RE5
RE3
RB1
RF9
RB9
RG1
RC1
RG9
RC9
RH1
RD1
RJ1
RD9
RA3
RA11
RB3
RF11
RB11
RG3
RC3
RG11
RC11
RH3
RD3
RJ3
RD11
VCC-SW
VCC-5V
CN20
CN21
In order to enable the PORTA pins to be
connected to pull-up resistors and the port
input pins to be supplied with a logic one (1),
it is necessary to place jumper J1 in the Up
position and jumper J13 in the GND position�
This enables any port PORTA input pin, when
it is in idle state, to be driven high (VCC-BRD)
over the 10k resistor�
As a result, every time you press the RA0 push
button, the RA0 pin will be fed with a logic zero
(0V), provided that switch 1 on the DIP switch
SW1 is set to the ON position�
VCC-BRD
J1
VCC-BRD
J13
VCC-BRD
0V
up
pull
down
In case that jumpers J1 and J13 are in the
same positions, pressure on any button will not
cause input pins to change their logic state�
Figure 17-6: Jumper J1 in pull-down and jumper J13 in pull-up position
Figure 17-7: Jumper J1 in pull-up and jumper J13 in pull-down position
Figure 17-8: Jumpers J1 and J13 in the same positions