AT90PWM2(2005) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2
(Rev.:2005)

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Alternate Port Functions

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

28 shows how the port pin control signals from the simplified Figure 25 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 28. 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

1

QD

0

PORTxn

DIEOExn

Q CLR

PTOExn

WPx

DIEOVxn

1

0

SLEEP

RESET

WRx

RRx

SYNCHRONIZER

D SET Q

L CLR Q

DQ

PINxn

CLR Q

RPx

clk I/O

DIxn

AIOxn

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

DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE

DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE

SLEEP: SLEEP CONTROL

PTOExn: Pxn, PORT TOGGLE OVERRIDE ENABLE

PUD: PULLUP DISABLE

WDx: WRITE DDRx

RDx: READ DDRx

RRx: READ PORTx REGISTER

WRx: WRITE PORTx

RPx: READ PORTx PIN

WPx: WRITE PINx

clkI/O: I/O CLOCK

DIxn: DIGITAL INPUT PIN n ON PORTx

AIOxn: ANALOG INPUT/OUTPUT PIN n ON PORTx

Note:

1. WRx, 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 23 summarizes the function of the overriding signals. The pin and port indexes

from Figure 28 are not shown in the succeeding tables. The overriding signals are gen-

erated internally in the modules having the alternate function.

68 AT90PWM2/3

4317B–AVR–02/05

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