Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 71)

ATmega8515(L)

2512A–AVR–04/02

Alternate Functions of Port E ThePort Epinswith alternate functions are showninTable 38.

Thealternate pin configuration is asfollows:

• OC1B – Port E, Bit 2

OC1B, Output Compare Match B output: ThePE2 pin can serve as an external output

for theTimer/Counter1 Output Compare B.The pin has to be configured as an output

(DDE2 set (one)) to serve thisfunction. The OC1Bpin is alsotheoutput pin for thePWM

modetimerfunction.

•ALE–PortE,Bit1

ALE is theexternaldata memory Address Latch Enable signal.

• ICP/INT2 – Port E, Bit 0

ICP–Input CapturePin: ThePE0 pin can actas an input capture pin for

Timer/Counter1.

INT2,ExternalInterrupt Source2: ThePE0 pin can serve as an external interrupt

source.

Table 39 relate thealternate functions of Port E to theoverriding signals showninFigure

32onpage 61.

Table 38. Port E Pins Alternate Functions

Port Pin Alternate Function

PE2 OC1B(Timer/Counter1 Output Compare BMatch Output)

PE1ALE (Address Latch EnabletoExternalMemory)

PE0

ICP (Timer/Counter1 Input CapturePin)

INT2 (ExternalInterrupt2Input)

Table 39. Overriding Signals for Alternate Functions PE2..PE0

Signal Name PE2 PE1 PE0

PUOE 0 SRE 0

PUOV0 00

DDOE 0 SRE 0

DDOV0 10

PVOE OC1BOVERRIDE ENABLE SRE 0

PVOV OC1B ALE 0

DIEOE 00INT2 ENABLED

DIEOV0 01

DI 00INT2 INPUT,ICP INPUT

AIO –––

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Rainbow-electronics ATmega8515L Manual de usuario Pagina 71