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參數(shù)資料
| 型號(hào)： | ID80C32E-25SHXXX:D |
| 廠商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 25 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | CERAMIC, DIP-40 |
| 文件頁(yè)數(shù)： | 28/210頁(yè) |
| 文件大?。?/td> | 5175K |
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123
8048C–AVR–02/12
ATtiny43U
If both ADATE and ADEN is written to one, an interrupt event can occur at any time. If the
ADMUX Register is changed in this period, the user cannot tell if the next conversion is based
on the old or the new settings. ADMUX can be safely updated in the following ways:
When ADATE or ADEN is cleared.
During conversion, minimum one ADC clock cycle after the trigger event.
After a conversion, before the Interrupt Flag used as trigger source is cleared.
When updating ADMUX in one of these conditions, the new settings will affect the next ADC
conversion.
16.6.1
ADC Input Channels
When changing channel selections, the user should observe the following guidelines to ensure
that the correct channel is selected:
In Single Conversion mode, always select the channel before starting the conversion. The
channel selection may be changed one ADC clock cycle after writing one to ADSC. However,
the simplest method is to wait for the conversion to complete before changing the channel
selection.
In Free Running mode, always select the channel before starting the first conversion. The
channel selection may be changed one ADC clock cycle after writing one to ADSC. However,
the simplest method is to wait for the first conversion to complete, and then change the
channel selection. Since the next conversion has already started automatically, the next
result will reflect the previous channel selection. Subsequent conversions will reflect the new
channel selection.
16.6.2
ADC Voltage Reference
The ADC reference voltage (V
REF) indicates the conversion range for the ADC. Single ended
channels that exceed V
REF will result in codes close to 0x3FF. VREF can be selected as either
V
CC, or internal 1.1V reference. The internal 1.1V reference is generated from the internal band-
gap reference (V
BG) through an internal amplifier.
The first ADC conversion result after switching reference voltage source may be inaccurate, and
the user is advised to discard this result.
16.7
ADC Noise Canceler
The ADC features a noise canceler that enables conversion during sleep mode. This reduces
noise induced from the CPU core and other I/O peripherals. The noise canceler can be used
with ADC Noise Reduction and Idle mode. To make use of this feature, the following procedure
should be used:
Make sure that the ADC is enabled and is not busy converting. Single Conversion mode must
be selected and the ADC conversion complete interrupt must be enabled.
Enter ADC Noise Reduction mode (or Idle mode). The ADC will start a conversion once the
CPU has been halted.
If no other interrupts occur before the ADC conversion completes, the ADC interrupt will
wake up the CPU and execute the ADC Conversion Complete interrupt routine. If another
interrupt wakes up the CPU before the ADC conversion is complete, that interrupt will be
executed, and an ADC Conversion Complete interrupt request will be generated when the
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