Rainbow-electronics ATtiny43U Manual de usuario descargar pdf (Pagina 128)

128

8048B–AVR–03/09

ATtiny43U

• Bit 4 – ADIF: ADC Interrupt Flag

This bit is set when an ADC conversion completes and the data registers are updated. The ADC

Conversion Complete Interrupt is executed if the ADIE bit and the I-bit in SREG are set. ADIF is

cleared by hardware when executing the corresponding interrupt handling vector. Alternatively,

ADIF is cleared by writing a logical one to the flag. Beware that if doing a Read-Modify-Write on

ADCSRA, a pending interrupt can be disabled. This also applies if the SBI instruction is used.

• Bit 3 – ADIE: ADC Interrupt Enable

When this bit is written to one and the I-bit in SREG is set, the ADC Conversion Complete Inter-

rupt is activated.

• Bits 2:0 – ADPS2:0: ADC Prescaler Select Bits

These bits determine the division factor between the system clock frequency and the input clock

to the ADC.

16.13.3 ADCL and ADCH – ADC Data Register

16.13.3.1 ADLAR = 0

16.13.3.2 ADLAR = 1

Table 16-5. ADC Prescaler Selections

ADPS2 ADPS1 ADPS0 Division Factor

000 2

001 2

010 4

011 8

100 16

101 32

110 64

111 128

Bit 151413121110 9 8

0x05 (0x25) – – – – – – ADC9 ADC8 ADCH

0x04 (0x24) ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADC1 ADC0 ADCL

76543210

Read/Write RRRRRRRR

RRRRRRRR

Initial Value 0 0 0 0 0 0 0 0

00000000

Bit 151413121110 9 8

0x05 (0x25) ADC9 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADCH

0x04 (0x24) ADC1 ADC0 – – – – – – ADCL

76543210

Read/Write RRRRRRRR

RRRRRRRR

Initial Value 0 0 0 0 0 0 0 0

00000000

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 181 182

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