Rainbow-electronics ATmega8515L Manuel d'utilisateur télécharger pdf (Page 64)

ATmega8515(L)

2512A–AVR–04/02

Alternate Functions Of Port B ThePort Bpinswith alternate functions are showninTable29.

Thealternate pin configuration is asfollows:

•SCK–PortB,Bit7

SCK: MasterClock output,Slave Clock input pin forSPIchannel. When the SPI is

enabled as a Slave, thispin isconfigured as an input regardless of the setting of DDB7.

When the SPI is enabled as a Master, the data direction of thispin iscontrolledby

DDB7. When the pin isforcedbythe SPI to beaninput, the pull-upcan still be con-

trolledbythePORTB7 bit.

• MISO – Port B, Bit 6

MISO: MasterData input,Slave Data output pin forSPIchannel. When the SPI is

enabled as a Master, thispin isconfigured as an input regardless of the setting of

DDB6. When the SPI is enabled as a Slave, the data direction of thispin iscontrolledby

Table 28. Overriding Signals for Alternate Functions in PA3..PA0

Signal

Name PA3/AD3 PA2/AD2 PA1/AD1 PA0/AD0

PUOE SRESRESRESRE

PUOV ~(WR

| ADA) •

PortA3

~(WR | ADA) •

PortA2

~(WR

| ADA) •

PortA1

~(WR

| ADA) •

PortA0

DDOE SRESRESRESRE

DDOV WR

| ADA WR | ADA WR | ADA WR | ADA

PVOE SRESRESRESRE

PVOVA3 •ADA |

D3 OUTPUT•

A2 • ADA |

D2 OUTPUT•

A1 • ADA |

D1 OUTPUT•

A0 • ADA |

D0 OUTPUT•

DIEOE 0000

DIEOV0 0 0 0

DI D3 INPUT D2 INPUT D1 INPUT D0 INPUT

AIO ––––

Table 29. Port B Pins Alternate Functions

Port Pin Alternate Functions

PB7 SCK (SPIBusSerialClock)

PB6 MISO (SPIBusMasterInput/Slave Output)

PB5 MOSI (SPIBusMasterOutput/Slave Input)

PB4 SS

(SPISlave Select Input)

PB3 AIN1 (Analog ComparatorNegative Input)

PB2AIN0 (Analog Comparator Positive Input)

PB1T1(Timer/Counter1 ExternalCounterInput)

PB0

T0 (Timer/Counter0 ExternalCounterInput)

OC0 (Timer/Counter0 Output Compare Match Output)

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 222 223

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