Rainbow-electronics ATmega128RFA1 Uživatelský manuál stáhnout pdf (Strana 409)

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8266A-MCU Wireless-12/09

ATmega128RFA1

• Bit 1:0 – ACIS1:0 - Analog Comparator Interrupt Mode Select

These bits determine which comparator events that trigger the Analog Comparator

interrupt. The different settings are shown in the following table. When changing the

ACIS1/ACIS0 bits, the Analog Comparator Interrupt must be disabled by clearing its

Interrupt Enable bit in the ACSR Register. Otherwise an interrupt can occur when the

bits are changed.

Table 26-2 ACIS Register Bits

0x00 Interrupt on Toggle

0x01 Reserved

0x02 Interrupt on Falling Edge

ACIS1:0

0x03 Interrupt on Rising Edge

26.2.2 ADCSRB – ADC Control and Status Register B

Bit 7 6 5 4 3 2 1 0

NA ($7B) ACME ADCSRB

Read/Write RW

Initial Value 0

• Bit 6 – ACME - Analog Comparator Multiplexer Enable

When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is

zero), the ADC multiplexer defines the negative input of the Analog Comparator. When

this bit is written logic zero, AIN1 is applied to the negative input of the Analog

Comparator. For a detailed description of this bit, see section "Analog Comparator

Multiplexed Input".

26.2.3 DIDR1 – Digital Input Disable Register 1

Bit 7 6 5 4 3 2 1 0

NA ($7F) AIN1D AIN0D DIDR1

Read/Write RW RW

Initial Value 0 0

• Bit 1 – AIN1D - AIN1 Digital Input Disable

When this bit is written logic one, the digital input buffer on the AIN1 pin is disabled. The

corresponding PIN Register bit will always read as zero when this bit is set. When an

analog signal is applied to the AIN1 pin and the digital input from this pin is not needed,

this bit should be written logic one to reduce power consumption in the digital input

buffer.

• Bit 0 – AIN0D - AIN0 Digital Input Disable

When this bit is written logic one, the digital input buffer on the AIN0 pin is disabled. The

corresponding PIN Register bit will always read as zero when this bit is set. When an

analog signal is applied to the AIN0 pin and the digital input from this pin is not needed,

this bit should be written logic one to reduce power consumption in the digital input

buffer.

1 2 ... 404 405 406 407 408 409 410 411 412 413 414 ... 523 524

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