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ATmega128
Figure 128. Boundary-scan Cells for Oscillators and Clock Options
To
Next
XTAL1/TOSC1
XTAL2/TOSC2
To
From Digital Logic
ShiftDR
Cell
EXTEST
0
Oscillator
OUTPUT
ENABLE
ShiftDR
next
cell
To System Logic
0
1
FF1
1
D
Q
D
G
Q
0
1
D
Q
From
ClockDR
UpdateDR
Previous
Cell
From
Previous
ClockDR
Cell
Table 102 summaries the scan registers for the external clock pin XTAL1, oscillators with
XTAL1/XTAL2 connections as well as 32kHz Timer Oscillator.
Table 102. Scan Signals for the Oscillators (1)(2)(3)
Scanned Clock
Scanned Clock Line
Enable signal
EXTCLKEN
OSCON
Line
EXTCLK (XTAL1)
OSCCK
Clock Option
External Clock
External Crystal
when not Used
0
0
External Ceramic Resonator
RCOSCEN
OSC32EN
TOSKON
RCCK
OSC32CK
TOSCK
External RC
Low Freq. External Crystal
32kHz Timer Oscillator
1
0
0
Notes:
1. Do not enable more than one clock source as main clock at a time.
2. Scanning an Oscillator output gives unpredictable results as there is a frequency drift between
the Internal Oscillator and the JTAG TCK clock. If possible, scanning an external clock is
preferred.
3. The clock configuration is programmed by fuses. As a fuse is not changed run-time, the clock
configuration is considered fixed for a given application. The user is advised to scan the same
clock option as to be used in the final system. The enable signals are supported in the scan
chain because the system logic can disable clock options in sleep modes, thereby disconnect-
ing the Oscillator pins from the scan path if not provided. The INTCAP fuses are not supported
in the scan-chain, so the boundary scan chain can not make a XTAL Oscillator requiring inter-
nal capacitors to run unless the fuse is correctly programmed.
Scanning the Analog
Comparator
The relevant Comparator signals regarding Boundary-scan are shown in Figure 129 . The
Boundary-scan cell from Figure 130 is attached to each of these signals. The signals are
described in Table 103 .
The Comparator need not be used for pure connectivity testing, since all analog inputs are
shared with a digital port pin as well.
259
2467X–AVR–06/11
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