atmega103 ATMEL Corporation, atmega103 Datasheet - Page 96

• Manufacturer Part Number: atmega103
• Description: Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Port D Schematics
96
ATmega103(L)
• IC1 – Port D, Bit 4
IC1, Input Capture pin for Timer/Counter1. When a positive or negative (selectable)
edge is applied to this pin, the contents of Timer/Counter1 is transferred to the
Timer/Counter1 Input Capture Register. The pin has to be configured as an input to
serve this function. See the Timer/Counter1 description on how to operate this function.
The internal pull-up MOS resistor can be activated as described above.
• T1 – Port D, Bit 6
T1, Timer/Counter1 counter source. See the Timer description for further details.
• T2 – Port D, Bit 7
T2, Timer/Counter2 counter source. See the Timer description for further details.
Note that all port pins are synchronized. The synchronization latches are, however, not
shown in the figures.
Figure 62. Port D Schematic Diagram (Pins PD0, PD1, PD2 and PD3)
PDn
MOS
PULL-
UP
WP:
WD:
RL:
RP:
RD:
n:
WRITE PORTD
WRITE DDRD
READ PORTD LATCH
READ PORTD PIN
READ DDRD
0, 1, 2, 3
RL
RP
Q
Q
PORTDn
RESET
RESET
DDDn
WD
WP
RD
R
C
R
C
INTn
D
D
0945I–AVR–02/07