ATmega8HVA Atmel Corporation, ATmega8HVA Datasheet - Page 114

• Manufacturer Part Number: ATmega8HVA
• Manufacturer: Atmel Corporation

Specifications of ATmega8HVA

• Flash (kbytes): 8 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 3
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 256
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -20 to 85
• I/o Supply Class: 1.8 to 9.0
• Operating Voltage (vcc): 1.8 to 9.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.4
20.4.1
20.4.2
114
Register Description
ATmega8HVA/16HVA
VADMUX – V-ADC Multiplexer Selection Register
VADCSR – V-ADC Control and Status Register
• Bit 7:4 – RES: Reserved Bits
These bits are reserved bits in the ATmega8HVA/16HVA and will always read as zero.
• Bit 3:0 – VADMUX3:0: V-ADC Channel Selection Bits
The VADMUX bits determine the V-ADC channel selection. See
Table 20-1.
Note:
• Bit 7:4 – RES: Reserved Bits
These bits are reserved bits in the ATmega8HVA/16HVA and will always read as zero.
• Bit 3 – VADEN: V-ADC Enable
Writing this bit to one enables V-ADC conversion. By writing it to zero, the V-ADC is turned off.
Turning the V-ADC off while a conversion is in progress will terminate this conversion. Note that
the bandgap voltage reference must be enabled separately, see “BGCCR – Bandgap Calibra-
tion C Register” on page 118.
• Bit 2 – VADSC: Voltage ADC Start Conversion
Write this bit to one to start a new conversion of the selected channel.
Bit
(0x7C)
Read/Write
Initial Value
Bit
(0x7A)
Read/Write
Initial Value
1. VTEMP must be measured in Active mode to get the highest accuracy when using calibration
VADMUX3:0
0111...1111
value stored in signature row.
0000
0001
0010
0011
0100
0101
0110
VADMUX channel selection
R
7
–
0
R
7
–
0
R
6
–
0
R
6
–
0
R
5
–
0
R
5
–
0
Channel Selected
R
R
4
–
0
4
–
0
RESERVED
RESERVED
RESERVED
VTEMP
CELL 1
CELL 2
ADC0
ADC1
VADMUX3
VADEN
R/W
R/W
3
0
3
0
(1)
VADMUX2
VADSC
R/W
R/W
2
0
2
0
Table 20-1 on page
VADMUX1
VADCCIF
R/W
R/W
1
0
1
0
VADMUX0
Scale
VADCCIE
0.2
0.2
1.0
1.0
1.0
R/W
–
–
–
R/W
0
0
0
0
8024A–AVR–04/08
114.
VADMUX
VADCSR