AT90S2313-4PC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT90S2313-4PC' PDF : 92 Pages View PDF
Port D Schematics
AT90S2313
• INT1 – Port D, Bit 3
INT1, External Interrupt Source 1. The PD3 pin can serve as an external interrupt
source to the MCU. See the interrupt description for further details and how to enable
the source.
• INT0 – Port D, 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
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
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 “1” in PORTD0 will turn on the internal pull-up.
Note that all port pins are synchronized. The synchronization latches are, however, not
shown in the figures.
Figure 44. Port D Schematic Diagram (Pin PD0)
MOS
PULL-
UP
PD0
RL
RD
RESET
Q
D
DDD0
C
WD
RESET
Q
D
PORTD0
C
WP
WP: WRITE PORTD
WD: WRITE DDRD
RL: READ PORTD LATCH
RP: READ PORTD PIN
RD: READ DDRD
RXD: UART RECEIVE DATA
RXEN: UART RECEIVE ENABLE
RP
RXEN
RXD
57
0839I–AVR–06/02
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