AT90S2313-4PC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT90S2313-4PC' PDF : 92 Pages View PDF
Figure 43. Port B Schematic Diagram (Pin PB7)
AT90S2313
Port D
0839I–AVR–06/02
Three I/O memory address locations are allocated for the Port D: one each for the Data
Register – PORTD, $12($32), Data Direction Register – DDRD, $11($31) and the Port D
Input Pins – PIND, $10($30). The Port D Input Pins address is read-only, while the Data
Register and the Data Direction Register are read/write.
Port D has seven bi-directional I/O pins with internal pull-up resistors, PD6..PD0. The
Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally pulled
low will source current if the pull-up resistors are activated.
Some Port D pins have alternate functions as shown in Table 19:
Table 19. Port D Pin Alternate Functions
Port Pin
PD0
PD1
Alternate Function
RXD (Receive data input for the UART)
TXD (Transmit data output for the UART)
PD2
PD3
PD4
INT0 (External interrupt 0 input)
INT1 (External interrupt 1 input)
TO (Timer/Counter0 external input)
PD5
PD6
T1 (Timer/Counter1 external input)
ICP (Timer/Counter1Input Capture pin)
When the pins are used for the alternate function, the DDRD and PORTD Registers
have to be set according to the alternate function description.
55
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