ATmega16HVB datasheet(120/273 Pages) ATMEL

120 / 273 page

120

8042A–AVR–07/09

ATmega16HVB/32HVB

20.4

20.4.1

VADMUX – V-ADC Multiplexer Selection Register

• Bit 7:4 – RES: Reserved Bits

These bits are reserved bits in the ATmega16HVB/32HVB 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 on page 120.

20.4.2

VADCSR – V-ADC Control and Status Register

• Bit 7:4 – RES: Reserved Bits

These bits are reserved bits in the ATmega16HVB/32HVB 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 “Bandgap Calibration” on page

124.

• Bit 2 – VADSC: Voltage ADC Start Conversion

Write this bit to one to start a new conversion of the selected channel.

Bit

7654

(0x7C)

––––

VADMUX3

VADMUX2

VADMUX1

VADMUX0

VADMUX

Read/Write

R/W

Initial Value

0000

Table 20-1.

VADMUX channel selection

VADMUX3:0

Channel Selected

Scale

0000

RESERVED

–

0001

CELL 1

0.2

0010

CELL 2

0.2

0011

CELL3

0.2

0100

CELL4

0.2

0101

VTEMP

1.0

0110

ADC0

1.0

0111

ADC1

1.0

1000...1111

RESERVED

–

Bit

321

(0x7A)

––

–

VADEN

VADSC

VADCCIF

VADCCIE

VADCSR

Read/Write

R/W

Initial Value

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