ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64(L)

Alternate Port Functions

Most port pins have alternate functions in addition to being general digital I/Os. Figure

33 shows how the port pin control signals from the simplified Figure 30 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 33. Alternate Port Functions(1)

PUOExn

PUOVxn

1

0

PUD

DDOExn

DDOVxn

1

0

PVOExn

PVOVxn

QD

DDxn

Q CLR

RESET

WDx

RDx

1

Pxn

0

QD

PORTxn

DIEOExn

Q CLR

WPx

DIEOVxn

1

0

SLEEP

RESET

RRx

SYNCHRONIZER

D SET Q

L CLR Q

DQ

PINxn

CLR Q

RPx

clk I/O

DIxn

PUOExn:

PUOVxn:

DDOExn:

DDOVxn:

PVOExn:

PVOVxn:

DIEOExn:

DIEOVxn:

SLEEP:

Pxn PULL-UP OVERRIDE ENABLE

Pxn PULL-UP OVERRIDE VALUE

Pxn DATA DIRECTION OVERRIDE ENABLE

Pxn DATA DIRECTION OVERRIDE VALUE

Pxn PORT VALUE OVERRIDE ENABLE

Pxn PORT VALUE OVERRIDE VALUE

Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE

Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE

SLEEP CONTROL

AIOxn

PUD:

WDx:

RDx:

RRx:

WPx:

RPx:

clkI/O:

DIxn:

AIOxn:

PULLUP DISABLE

WRITE DDRx

READ DDRx

READ PORTx REGISTER

WRITE PORTx

READ PORTx PIN

I/O CLOCK

DIGITAL INPUT PIN n ON PORTx

ANALOG INPUT/OUTPUT PIN n ON PORTx

Note: 1. WPx, WDx, RLx, 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 26 summarizes the function of the overriding signals. The pin and port indexes

from Figure 33 are not shown in the succeeding tables. The overriding signals are gen-

erated internally in the modules having the alternate function.

69

2490G–AVR–03/04

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