Rainbow-electronics ATmega8515L Instrukcja Użytkownika Pobierz pdf (Strona 61)

ATmega8515(L)

2512A–AVR–04/02

Alternate Port Functions Most port pinshave alternate functions in addition to being generaldigitalI/Os. Figure

32 shows how the port pin controlsignals from the simplifiedFigure29can beoverrid-

den by alternate functions.Theoverriding signals may not be present in all port pins, but

the figure serves as agenericdescription applicabletoall port pins in the AVR micro-

controllerfamily.

Figure 32. Alternate Port Functions

(1)

Note: 1. WPx, WDx, RRx, RPx, and RDx are commontoall pinswithin the same port. clk

I/O

SLEEP, and PUD are common to all ports.All othersignals are unique for each pin.

Table25summarizes the function of theoverriding signals.The pin andportindexes

from Figure 32are not showninthe succeeding tables.Theoverriding signals are gen-

erated internally in themoduleshaving thealternate function.

clk

RPx

RRx

WPx

RDx

WDx

PUD

SYNCHRONIZER

WDx: WRITE DDRx

WPx: WRITE PORTx

RRx: READ PORTx REGISTER

RPx: READ PORTx PIN

PUD: PULLUP DISABLE

clk

I/O

: I/O CLOCK

RDx: READ DDRx

SET

CLR

DIxn

AIOxn

DIEOExn

PVOVxn

PVOExn

DDOVxn

DDOExn

PUOExn

PUOVxn

PUOExn: Pxn PULL-UP OVERRIDE ENABLE

PUOVxn: Pxn PULL-UP OVERRIDE VALUE

DDOExn: Pxn DATA DIRECTION OVERRIDE ENABLE

DDOVxn: Pxn DATA DIRECTION OVERRIDE VALUE

PVOExn: Pxn PORT VALUE OVERRIDE ENABLE

PVOVxn: Pxn PORT VALUE OVERRIDE VALUE

DIxn: DIGITAL INPUT PIN n ON PORTx

AIOxn: ANALOG INPUT/OUTPUT PIN n ON PORTx

RESET

CLR

PINxn

PORTxn

DDxn

DATA B US

DIEOVxn

SLEEP

DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE

DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE

SLEEP: SLEEP CONTROL

Pxn

I/O

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 222 223

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