ATmega163(L)
110
Port D
Port D is an 8 bit bi-directional I/O port with internal pull-up resistors.
Three I/O memory address locations are allocated for 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.
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 48.
The Port D Data Register - PORTD
The Port D Data Direction Register - DDRD
The Port D Input Pins Address - PIND
The Port D Input Pins address - PIND - is not a register, and this address enables access to the physical value on each
Port D pin. When reading PORTD, the PORTD Data Latch is read, and when reading PIND, the logical values present on
the pins are read.
Port D As General Digital I/O
PDn, General I/O pin: The DDDn bit in the DDRD register selects the direction of this pin. If DDDn is set (one), PDn is con-
figured as an output pin. If DDDn is cleared (zero), PDn is configured as an input pin. If PDn is set (one) when configured
as an input pin the MOS pull up resistor is activated. To switch the pull up resistor off the PDn has to be cleared (zero), the
Table 48. Port D Pins Alternate Functions
Port Pin Alternate Function
PD0 RXD (UART Input Pin)
PD1 TXD (UART Output Pin)
PD2 INT0 (External Interrupt 0 Input)
PD3 INT1 (External Interrupt 1 Input)
PD4 OC1B (Timer/Counter1 Output CompareB Match Output)
PD5 OC1A (Timer/Counter1 Output CompareA Match Output)
PD6 ICP (Timer/Counter1 Input Capture Pin)
PD7 OC2 (Timer/Counter2 Output Compare Match Output)
Bit 76543210
$12 ($32) PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 PORTD
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial value00000000
Bit 76543210
$11 ($31) DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 DDRD
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial value00000000
Bit 76543210
$10 ($30) PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 PIND
Read/Write RRRRRRRR
Initial value N/A N/A N/A N/A N/A N/A N/A N/A
(30 Seiten)
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