Техническая Спецификация для Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO
Модели
ATSAMD20-XPRO
550
Atmel | SMART SAM D20 [DATASHEET]
Atmel-42129K–SAM-D20_datasheet–06/2014
30.8.2 Control B
Name:
CTRLB
Offset:
0x1
Reset:
0x00
Property:
Write-Protected
z
Bits 7:6 – REFSEL[1:0]: Reference Selection
These bits select the reference voltage for the DAC according to
These bits select the reference voltage for the DAC according to
.
Table 30-1. Reference Selection
z
Bits 5:4 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z
Bit 3 – VPD: Voltage Pump Disable
This bit controls the behavior of the voltage pump.
This bit controls the behavior of the voltage pump.
0: Voltage pump is turned on/off automatically.
1: Voltage pump is disabled.
z
Bit 2 – LEFTADJ: Left-Adjusted Data
This bit controls how the 10-bit conversion data is adjusted in the Data and Data Buffer registers.
This bit controls how the 10-bit conversion data is adjusted in the Data and Data Buffer registers.
0: DATA and DATABUF registers are right-adjusted.
1: DATA and DATABUF registers are left-adjusted.
z
Bit 1 – IOEN: Internal Output Enable
0: Internal DAC output not enabled.
0: Internal DAC output not enabled.
1: Internal DAC output enabled to be used by the AC.
z
Bit 0 – EOEN: External Output Enable
0: The DAC output is turned off.
1: The high-drive output buffer drives the DAC output to the V
0: The DAC output is turned off.
1: The high-drive output buffer drives the DAC output to the V
OUT
pin.
Bit
7
6
5
4
3
2
1
0
REFSEL[1:0]
-
VPD
LEFTADJ
IOEN
EOEN
Access
R/W
R/W
R
R
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
REFSEL[1:0]
Reference Selection
Description
0x0
INT1V
Internal 1.0V reference
0x1
AVCC
AV
CC
0x2
VREFP
External reference
0x3
Reserved