M I K R O E L E K T R O N I K A S O F T W A R E A N D H A R D W A R E S O L U T I O N S F O R T H E E M B E D D E D W O R L D
EasyAVR
USB
4
EasyAVR4 User
’
s Manual
MikroElektronika
Development
tools
1
12
2
page
OO
SS
CC
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AA
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OSCILLATOR
EasyAVR4 development board has on-board oscillator circuit for generating microcon-
troller’s clock input. Within the
AVRprog
programmer you can either choose internal RC
oscillator or external clock. External oscillator is connected to the XT1 pin of the microcon-
troller. Microcontroller in DIP8 package doesn’t have pin that is dedicated only for the
oscillator clock input. Because of the small pin count, it has PB4 pin multiplexed between
I/O and clock input function.
Figure 12.
Oscillator
Note:
Jumper J13 should be enabled only if you want to use DIP8 microcontroller with
external clock source.
If you want to use pin PB4 with I/O function you should use internal RC oscillator. If you
don’t need I/O function of the PB4 pin, then you can use on-board oscillator by enabling
jumper J13. By doing this, you are making a direct connection between the oscillator circuit
and PB4 pin.
