ATmega16 datasheet(52/315 Pages) ATMEL

52 / 315 page

ATmega16(L)

2466E–AVR–10/02

Alternate Port Functions

Most port pins have alternate functions in addition to being General Digital I/Os. Figure

26 shows how the port pin control signals from the simplified Figure 23 can be overrid-

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

the figure serves as a generic description applicable to all port pins in the AVR micro-

controller family.

Figure 26. Alternate Port Functions

(1)

Note:

1. WPx, WDx, RRx, RPx, and RDx are common to all pins within the same port. clkI/O,

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

Table 21 summarizes the function of the overriding signals. The pin and port indexes

from Figure 26 are not shown in the succeeding tables. The overriding signals are gen-

erated internally in the modules having the alternate 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

DIEOVxn

SLEEP

DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE

DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE

SLEEP:

SLEEP CONTROL

Pxn

I/O

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