ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 274

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

21.4.2.2
274
Atmel ATmega16/32/64/M1/C1
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
register 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
writing 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 reg-
ister 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
DAC9
DAC1
R/W
R/W
7
0
0
DAC8
DAC0
R/W
R/W
6
0
0
DAC7
R/W
R/W
5
0
0
-
DAC6
R/W
R/W
4
0
0
-
DAC5
R/W
R/W
3
0
0
-
DAC4
R/W
R/W
2
0
0
-
DAC3
R/W
R/W
1
0
0
-
DAC2
R/W
R/W
0
0
0
-
7647G–AVR–09/11
DACH
DACL