ATMEGA169 ATMEL [ATMEL Corporation], ATMEGA169 Datasheet - Page 238
ATMEGA169
Manufacturer Part Number
ATMEGA169
Description
8-bit Microcontroller with 16K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATMEGA169.pdf
(365 pages)
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Scanning the RESET Pin
238
ATmega169/V
Figure 110. General Port Pin Schematic Diagram
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 Fig-
ure 111 is inserted both for the 5V reset signal; RSTT, and the 12V reset signal;
RSTHV.
Figure 111. Observe-only Cell
See Boundary-scan
Description for Details!
Pxn
From System Pin
PUD:
PUExn:
OCxn:
ODxn:
IDxn:
SLEEP:
IDxn
PULLUP DISABLE
PULLUP ENABLE for pin Pxn
OUTPUT CONTROL for pin Pxn
OUTPUT DATA to pin Pxn
INPUT DATA from pin Pxn
SLEEP CONTROL
PUExn
Previous
From
Cell
ShiftDR
0
1
SLEEP
OCxn
ClockDR
ODxn
SYNCHRONIZER
D
L
WDx:
RDx:
WRx:
RRx:
RPx:
WPx:
CLK
Q
Q
D
I/O
FF1
:
Q
D
WRITE DDRx
READ DDRx
WRITE PORTx
READ PORTx REGISTER
READ PORTx PIN
WRITE PINx REGISTER
I/O CLOCK
PINxn
Next
Cell
Q
Q
To
RESET
RESET
PORTxn
Q
Q
Q
Q
DDxn
CLR
CLR
D
D
To System Logic
RRx
CLK
PUD
WDx
RDx
RPx
1
0
I/O
2514P–AVR–07/06
WPx
WRx
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