Texas Instruments MSP430x1xx - Manual (Page 301)

Conversion Modes
15-11
ADC12
Figure 15–5. Single-Channel, Single-Conversion Mode
ADC12
off
x = CStartAdd
Wait for Enable
ENC =
Wait for Trigger
Sample, Input
Channel Defined in
ADC12MCTLx
ENC =
ENC =
SHS = 0
and
ENC =
and
ADC12SC =
SAMPCON =
SAMPCON = 1
Convert, use
12 x ADC12CLK
SAMPCON =
ENC = 0
ENC = 0 †
< 12 x ADC12CLK
Conversion
Completed,
Result Stored Into
ADC12MEMx,
ADC12IFG.x is Set
1 x ADC12CLK
† Conversion result is unpredictable
ENC = 0 †
ADC12ON = 1
CONSEQ = 0
An example of the conversion-memory setup is shown in Figure 15–6 for
single-channel conversion. The example uses the following conditions:
- Single conversion of channel a4
- Internal reference voltage with V
R+
at AV
CC
and with V
R–
at AV
SS
- Conversion result to be stored in conversion-memory register
ADC12MEM1
This means that control bit CStartAdd in ADC12CTL0 is assigned a value of
1. The channel (INCH=4) and reference voltages (Sref=0) are selected via
ADC12MCTL1.