atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 269

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

21.4.2
21.4.2.1
21.4.2.2
7647A–AVR–02/08
Digital to Analog Converter input Register – DACH and DACL
DALA = 0
DALA = 1
Table 1. DAC Auto Trigger source selection (Continued)
• Bit 2 – DALA: Digital to Analog Left Adjust
Set this bit to left adjust the DAC input data.
Clear it to right adjust the DAC input data.
The DALA bit affects the configuration of the DAC data registers. Changing this bit affects the
DAC output on the next DACH writing.
• Bit 1 – DAOE: Digital to Analog Output Enable bit
Set this bit to output the conversion result on D2A,
Clear it to use the DAC internally.
• Bit 0 – DAEN: Digital to Analog Enable bit
Set this bit to enable the DAC,
Clear it to disable the DAC.
DACH and DACL registers contain the value to be converted into analog voltage.
Writing the DACL register prohibits the update of the input value until DACH has not been writ-
ten too. So the normal way to write a 10-bit value in the DAC register is firstly to write DACL the
DACH.
In order to work easily with only 8 bits, there is the possibility to left adjust the input value. Like
this it is sufficient to write DACH to update the DAC value.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
DATS2
1
1
1
1
DATS1
0
0
1
1
DAC7
DAC9
DAC1
R/W
R/W
R/W
R/W
7
0
0
7
0
0
-
DAC6
DAC8
DAC0
R/W
R/W
R/W
R/W
DATS0
0
1
0
1
6
0
0
6
0
0
-
DAC5
DAC7
R/W
R/W
R/W
R/W
5
0
0
5
0
0
-
-
Description
Timer/Counter0 Overflow
Timer/Counter1 Compare Match B
Timer/Counter1 Overflow
Timer/Counter1 Capture Event
DAC4
DAC6
R/W
R/W
R/W
R/W
4
0
0
4
0
0
-
-
DAC3
DAC5
R/W
R/W
R/W
R/W
3
0
0
3
0
0
-
-
ATmega32/64/M1/C1
DAC2
DAC4
R/W
R/W
R/W
R/W
2
0
0
2
0
0
-
-
DAC9
DAC1
DAC3
R/W
R/W
R/W
R/W
1
0
0
1
0
0
-
DAC8
DAC0
DAC2
R/W
R/W
R/W
R/W
0
0
0
0
0
0
-
DACH
DACL
DACH
DACL
269