AVR Internal Hardware Port D - Revision history

Admin: Created page with "= Port D = Port D Pins Alternate Functions
2013-02-13T12:19:51Z

Created page with "= <span class="f_Header">Port D</span> = <span style="font-family: Arial;"> </span> <span style="font-family: Arial;"> </span> Port D Pins Alternate Functions <di..."

New page
= <span class="f_Header">Port D</span> =

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

Port D Pins Alternate Functions
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="489" cellspacing="0" cellpadding="1" border="1" style="border: 1px solid rgb(0, 0, 0); border-spacing: 0px;"
|- style="vertical-align: top;"
| valign="top" width="24%" bgcolor="#ffffb2" style="width: 113px; background-color: rgb(255, 255, 178); border: 1px solid rgb(0, 0, 0);" |
<span style="font-weight: bold;">Port</span>

| valign="top" width="18%" bgcolor="#ffffb2" style="width: 83px; background-color: rgb(255, 255, 178); border: 1px solid rgb(0, 0, 0);" |
<span style="font-weight: bold;">Pin</span>

| valign="top" width="66%" bgcolor="#ffffb2" style="width: 279px; background-color: rgb(255, 255, 178); border: 1px solid rgb(0, 0, 0);" |
<span style="font-weight: bold;">Alternate Function</span>

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.0

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
RDX

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(UART Input line )

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.1

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
TDX

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(UART Output line)

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.2

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
INT0

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(External interrupt 0 input)

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.3

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
INT1

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(External interrupt 1 input)

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.5

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
OC1A

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(Timer/Counter1 Output compareA match output)

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.6

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
WR

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(Write strobe to external memory)

|- style="vertical-align: top;"
| valign="top" width="24%" style="width: 113px; border: 1px solid rgb(0, 0, 0);" |
PORTD.7

| valign="top" width="18%" style="width: 83px; border: 1px solid rgb(0, 0, 0);" |
RD

| valign="top" width="66%" style="width: 279px; border: 1px solid rgb(0, 0, 0);" |
(Read strobe to external memory)

|}
</div>
<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

RD - PORTD, Bit 7

RD is the external data memory read control strobe.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

WR - PORTD, Bit 6

WR is the external data memory write control strobe.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

OC1- PORTD, Bit 5

Output compare match output: The PD5 pin can serve as an external output when the Timer/Counter1 com-pare matches.

<span style="font-family: Arial;"> </span>

The PD5 pin has to be configured as an out-put (DDD5 set (one)) to serve this f unction. See the Timer/Counter1 description for further details, and how to enable the output. The OC1 pin is also the output pin for the PWM mode timer function.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

INT1 - PORTD, Bit 3

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

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

INT0 - PORTD, 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.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

TXD - PORTD, 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.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

RXD - PORTD, Bit 0

Receive Data (Data input pin for the UART). When the UART receiver is enabled this pin is configured as an output regardless of the value of DDRD0. When the UART forces this pin to be an input, a logical one in PORTD0 will turn on the internal pull-up.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

When pins TXD and RXD are not used for RS-232 they can be used as an input or output pin.

<span style="font-family: Arial;"> </span>

No PRINT, INPUT or other RS-232 statement may be used in that case.

<span style="font-family: Arial;"> </span>

The UCR register will by default not set bits 3 and 4 that enable the TXD and RXD pins for RS-232 communication. It is however reported that this not works for all chips. In this case you must clear the bits in the UCR register with the following statements:

<span style="font-family: Arial;"> </span>

RESET UCR.3

RESET UCR.4

or as an alernative : UCR=0

{{Languages}}

[[Category:BASCOM_HARDWARE]]