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ATmega169P Datasheet(PDF) 264 Page - ATMEL Corporation

Part # ATmega169P
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P Datasheet(HTML) 264 Page - ATMEL Corporation

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264
8018N–AVR–08/09
ATmega169P
25.5.2
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 Figure 25-5 is
inserted both for the 5V reset signal; RSTT, and the 12V reset signal; RSTHV.
Figure 25-5. Observe-only Cell
25.5.3
Scanning the Clock Pins
The AVR devices have many clock options selectable by fuses. These are: Internal RC Oscilla-
tor, External Clock, (High Frequency) Crystal Oscillator, Low-frequency Crystal Oscillator, and
Ceramic Resonator.
Figure 25-6 shows how each Oscillator with external connection is supported in the scan chain.
The Enable signal is supported with a general Boundary-scan cell, while the Oscillator/clock out-
put is attached to an observe-only cell. In addition to the main clock, the timer Oscillator is
scanned in the same way. The output from the internal RC Oscillator is not scanned, as this
Oscillator does not have external connections.
Figure 25-6. Boundary-scan Cells for Oscillators and Clock Options
0
1
DQ
From
Previous
Cell
ClockDR
ShiftDR
To
Next
Cell
From System Pin
To System Logic
FF1
0
1
DQ
From
Previous
Cell
ClockDR
ShiftDR
To
Next
Cell
To System Logic
FF1
0
1
DQ
DQ
G
0
1
From
Previous
Cell
ClockDR
UpdateDR
ShiftDR
To
Next
Cell
EXTEST
From Digital Logic
XTAL1/TOSC1
XTAL2/TOSC2
Oscillator
ENABLE
OUTPUT



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