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Section 5
The AVR AT90ICEPRO Clock System
The AVR AT90ICEPRO system can use one out of three available clock sources; the
programmable internal clock in the ICEPRO, a crystal or an external oscillator in the
user application.
The internal clock can be adjusted between 400 kHz and 20 MHz. Any frequency within
this range can be selected, and will be produced with an accuracy better than 200 PPM
for most frequencies.
Note:
The breakpoint logic will not work properly at clock frequencies above 10 MHz.
If an external clock source in the user application will be used, this can be in the range
between 32.768 kHz and 10 MHz. To use an external clock source, select External
Oscillator in the Emulator Options menu in AVR Studio. It is important to select the
proper range in the Clock Range menu to make the clock system work properly with an
external crystal.
On the pod card, the XTAL pins is connected to the ICE by using the 2-wire cable. Con-
nect from J103 to the 2-pin header nearest the pod cable connector you are using (see
Table 5-1).
Table 5-1. Pin Connection
Device
S1200 or S2313
S4414 or S8515
S2313 or S2343
S4434 or S8535
S4433 or S2333
Connect J103 and …
J305
J306
J307
J308
J309
Note:
Pin 1 on each connector is labeled with *.
If the clock source from the user application is a crystal, jumper J101 must be left open.
If the clock source from the user application is an oscillator, jumper J101 must be
shorted with a jumper. The switch S101 must be in position OFF in both cases.
Long leads from your external crystal to the oscillator circuit on the pod may cause you
problems. It is possible to mount a crystal in the socket near J103. Do not use the 2-wire
cable if you choose this option. If the crystal frequency is below 1.000 MHz, this should
be selected in the Clock Range menu in Emulator Options in AVR Studio and S101
should be in position ON. S101 should be in position OFF under all other circumstances.
AT90ICEPRO User Guide
Note:
A crystal cannot be used with S2343 devices.
5-1
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