Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 69)

8052B–AVR–09/08

ATmega4HVD/8HVD

14.3.1 Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 14-3.

The alternate pin configuration is as follows:

• MISO/CKOUT/T1 - Port B, Bit 2

MISO : Slave Data Output pin for SPI programming

When not operating in programming mode, this pin can serve as Clock Output, CPU clock

divided by 2. When not operating in programming mode or as clock output, the pin can be

used as clock input for Time/Counter1

• SCK/SGND/T0 - Port B, Bit 1

SCK : Clock Input pin for SPI programming

When not operating in programming mode, this pin can serve as ground reference for ADC0

channel by configuring the pin as output low. When not used as SGND, the pin can be used as

clock input for Time/Counter0.

• ADC0 - Port B, Bit 0

Analog to Digital Converter, channel 0.

Table 14-3. Port B Pins Alternate Functions

Port Pin Alternate Function

PB2

MISO/CKOUT/T1 (SPI Bus Serial DataOutput, Clock Output,

Timer/Counter Clock Input)

PB1

SCK/SGND/T0 (SPI Bus Master Clock input, GND for ADC0

measurements, Timer/Counter 0 Clock Input)

PB0 ADC0 (ADC Input Channel 0)

Table 14-4. Overriding Signals for Alternate Functions in PB2:0

Signal Name PB2/MISO/CKOUT/T1 PB1/SCK/SGND/T0 PB0/ADC0

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 167 168

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Rainbow-electronics ATmega8HVD Manuel d'utilisateur Page 69