ATMEGA64M1-AU Atmel, ATMEGA64M1-AU Datasheet - Page 267

• Manufacturer Part Number: ATMEGA64M1-AU
• Description: IC MCU AVR 64K FLASH 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64M1-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Lead Free Status / Rohs Status: Details

24.5.2.1
24.5.2.2
8209D–AVR–11/10
DALA = 0
DALA = 1
To work with the 10-bit DAC, two registers have to be updated. In order to avoid intermediate
value, the DAC input values which are really converted into analog signal are buffered into
unreachable registers. In normal mode, the update of the shadow register is done when the reg-
ister DACH is written.
In case DAATE bit is set, the DAC input values will be updated on the trigger event selected
through DATS bits.
In order to avoid wrong DAC input values, the update can only be done after having written
respectively DACL and DACH registers. It is possible to work on 8-bit configuration by only writ-
ing the DACH value. In this case, update is done each trigger event.
In case DAATE bit is cleared, the DAC is in an automatic update mode. Writing the DACH regis-
ter automatically update the DAC input values with the DACH and DACL register values.
It means that whatever is the configuration of the DAATE bit, changing the DACL register has no
effect on the DAC output until the DACH register has also been updated. So, to work with 10
bits, DACL must be written first before DACH. To work with 8-bit configuration, writing DACH
allows the update of the DAC.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
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
6
0
0
6
0
0
-
DAC5
DAC7
R/W
R/W
R/W
R/W
5
0
0
5
0
0
-
-
DAC4
DAC6
R/W
R/W
R/W
R/W
4
0
0
4
0
0
-
-
ATmega16M1/32M1/64M1
DAC3
DAC5
R/W
R/W
R/W
R/W
3
0
0
3
0
0
-
-
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
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