ATA8741-PXQW【PDF 153/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

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153

9140CINDCO02/10

ATA8741

" Bit 2 ACIC: Analog Comparator Input Capture Enable

When written logic one, this bit enables the input capture function in Timer/Counter1 to be trig-

gered by the Analog Comparator. The comparator output is in this case directly connected to the

input capture front-end logic, making the comparator utilize the noise canceler and edge select

features of the Timer/Counter1 Input Capture interrupt. When written logic zero, no connection

between the Analog Comparator and the input capture function exists. To make the comparator

trigger the Timer/Counter1 Input Capture inter-rupt, the ICIE1 bit in the Timer Interrupt Mask

" Bits 1, 0 ACIS1, ACIS0: Analog Comparator Interrupt Mode Select

These bits determine which comparator events that trigger the Analog Comparator interrupt. The

different settings are shown in Table 24-2.

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.

24.2.3

DIDR0 Digital Input Disable Register 0

" Bits 1, 0 ADC0D,ADC1D: ADC 1/0 Digital input buffer disable

When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corre-

sponding PIN Register bit will always read as zero when this bit is set. When an analog signal is

applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be writ-

ten logic one to reduce power consumption in the digital input buffer.

Table 24-2. ACIS1/ACIS0 Settings

ACIS1

ACIS0

Interrupt Mode

Comparator Interrupt on Output Toggle.

Reserved

Comparator Interrupt on Falling Output Edge.

Comparator Interrupt on Rising Output Edge.

Bit

0x01 (0x21)

ADC7D

ADC6D

ADC5D

ADC4D

ADC3D

ADC2D

ADC1D

ADC0D

DIDR0

Read/Write

R/W

Initial Value

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