atmega163l ATMEL Corporation, atmega163l Datasheet - Page 130
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atmega163l
Manufacturer Part Number
atmega163l
Description
Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA163L.pdf
(187 pages)
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Port D Schematics
130
ATmega163(L)
• INT0 – PORTD, Bit 2
INT0, External Interrupt Source 0: The PD2 pin can serve as an External Interrupt
Source to the MCU. See the interrupt description for further details, and how to enable
the source.
• TXD – Port D, Bit 1
TXD, Transmit Data (Data output pin for the UART). When the UART Transmitter is
enabled, this pin is configured as an output regardless of the value of DDRD1.
• RXD – Port D, Bit 0
RXD, Receive Data (Data input pin for the UART). When the UART Receiver is enabled
this pin is configured as an input regardless of the value of DDRD0. When the UART
forces this pin to be an input, a logical one in PORTD0 will turn on the internal pull-up.
Note that all port pins are synchronized. The synchronization latches are not shown in
the figures.
Figure 74. PORTD Schematic Diagram (Pin PD0)
PD0
WP:
WD:
RL:
RP:
RD:
RXD:
RXEN:
PUD:
MOS
PULL-
UP
WRITE PORTD
WRITE DDRD
READ PORTD LATCH
READ PORTD PIN
READ DDRD
UART RECEIVE DATA
UART RECEIVE ENABLE
PULL-UP DISABLE
PUD
RL
RP
Q
Q
PORTD0
RESET
RESET
DDD0
WD
WP
RD
C
C
D
D
RXEN
RXD
1142E–AVR–02/03
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