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ATmega325P датащи(PDF) 221 Page - ATMEL Corporation

номер детали ATmega325P
подробное описание детали  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P датащи(HTML) 221 Page - ATMEL Corporation

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221
8023F–AVR–07/09
ATmega325P/3250P
21.9.3
ADCL and ADCH – The ADC Data Register
21.9.3.1
ADLAR = 0
21.9.3.2
ADLAR = 1
When an ADC conversion is complete, the result is found in these two registers. When ADCL is
read, the ADC Data Register is not updated until ADCH is read. Consequently, if the result is left
adjusted and no more than 8-bit precision is required, it is sufficient to read ADCH. Otherwise,
ADCL must be read first, then ADCH.
The ADLAR bit in ADMUX, and the MUXn bits in ADMUX affect the way the result is read from
the registers. If ADLAR is set, the result is left adjusted. If ADLAR is cleared (default), the result
is right adjusted.
• ADC9:0: ADC Conversion Result
These bits represent the result from the conversion, as detailed in ”ADC Conversion Result” on
page 216.
100
16
101
32
110
64
111
128
Table 21-4.
ADC Prescaler Selections (Continued)
ADPS2
ADPS1
ADPS0
Division Factor
Bit
1514
131211
10
9
8
(0x79)
–
–
–
–
–
–
ADC9
ADC8
ADCH
(0x78)
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
ADCL
76
543
210
Read/Write
R
RRR
RRR
R
R
RRR
RRR
R
Initial Value
0
0
0
0
0
0
0
0
00
000
000
Bit
1514
1312
1110
9
8
(0x79)
ADC9
ADC8
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADCH
(0x78)
ADC1
ADC0
–
–
–
–
–
–
ADCL
76
54
32
10
Read/Write
RR
RR
RR
RR
RR
RR
RR
RR
Initial Value
0
0
0
0
0
0
0
0
00
00
00
00



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