AT43USB355 datasheet(65/115 Pages) ATMEL

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AT43USB355

2603G–USB–04/06

ADC Data Register – ADCL and ADCH

When an ADC conversion is complete, the result is found in these two registers. In Free Run

Mode, it is essential that both registers are read, and that ADCL is read before ADCH.

Scanning Multiple

Channels

Since change of analog channels is always delayed until a conversion is finished, the Free

Run Mode can be used to scan multiple channels without interrupting the converter. Typically,

the ADC Conversion Complete interrupt will be used to perform the channel shift. However,

the user should take the following fact into consideration:

The interrupt triggers once the result is ready to be read. In Free Run Mode, the next conver-

sion will start immediately when the interrupt triggers. If ADMUX is changed after the interrupt

triggers, the next conversion has already started and the old setting is used.

Table 23. ADC Prescaler Selections

ADPS2

ADPS1

ADPS0

Division Factor

0002

0012

0104

0118

100

101

110

111

128

Bit

$03 ($23)

–

ADC9

ADC8

ADCH

$24 ($44)

ADC7

ADC6

ADC5

ADC4

ADC3

ADC2

ADC1

ADC0

ADCL

Read/Write

Initial Value

AT43USB355 数据表(PDF) 65 Page - ATMEL Corporation

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