AT90S8515

Manufacturer Part NumberAT90S8515
Description8-bit microcontroller with 8K bytes in-system programmable flash, 2.7-6.0V
ManufacturerATMEL Corporation
AT90S8515 datasheet
 
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Page 74/112:

Port D Schematics

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Port D Schematics

AT90S8515
74
• 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 53. Port D Schematic Diagram (Pin PD0)
MOS
PULL-
UP
PD0
WP:
WRITE PORTD
WD:
WRITE DDRD
RL:
READ PORTD LATCH
READ PORTD PIN
RP:
RD:
READ DDRD
RXD:
UART RECEIVE DATA
RXEN:
UART RECEIVE ENABLE
RD
RESET
Q
D
DDD0
C
WD
RESET
Q
D
PORTD0
C
RL
WP
RP
RXEN
RXD
0841G–09/01