Datasheet

Figure 29-7 Additional Scan Signal for the Two-wire Interface
PUExn
OCxn
ODxn
TWIEN
IDxn
Slew-rate limited
SRC
Pxn
29.13.3. Scanning the RESET Pin
The RESET pin accepts 5V active low logic for standard Reset operation, and 12V active high logic for
High Voltage Parallel programming. An observe-only cell as shown in the figure below is inserted both for
the 5V Reset signal; RSTT, and the 12V Reset signal; RSTHV.
Figure 29-8 Observe-only Cell
0
1
D Q
From
pre vious
ce ll
ClockDR
ShiftDR
To
ne xt
ce ll
From sys tem pin
To s ys te m logic
FF1
29.13.4. Scanning the Clock Pins
The AVR devices have many clock options selectable by fuses. These are: Internal RC Oscillator,
External RC, External Clock, (High Frequency) Crystal Oscillator, Low-frequency Crystal Oscillator, and
Ceramic Resonator.
Atmel ATmega64A [DATASHEET]
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