Texas Instruments MSP430x1xx - Manual (Page 309)

Conversion Modes
15-19
ADC12
An illustration of repeat-sequence-of-channels mode is shown in
Figure 15–12.
Figure 15–12. Repeat-Sequence-of-Channels 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 =
< 12 x ADC12CLK
Conversion
Completed,
Result Stored Into
ADC12MEMx,
ADC12IFG.x is Set
1 x ADC12CLK
ADC12ON = 1
CONSEQ = 3
MSC = 1
and
SHP = 1
and
(ENC = 1
or
EOS.x = 0)
ENC = 0
and
EOS.x = 1
(MSC = 0
or
SHP = 0)
and
(ENC = 1
or
EOS.x = 0)
If EOS.x = 1 then x = CStartAdd
else {if x < 15 then x = x + 1
else x = 0}
If EOS.x = 1 then x = CStartAdd
else {if x < 15 then x = x + 1
else x = 0}
15.5.5 Switching Between Conversion Modes
Changing the mode of operation of the ADC12 while the converter is not ac-
tively running is done simply by selecting the new mode of operation with the
CONSEQ bits. However, if the conversion mode is changed while the convert-
er is actively running, intermediate and undesirable modes can be accidentally
selected if both CONSEQ bits are changed in a single instruction. Therefore,
the following mode changes should be avoided while the converter is running:
0
→
3, 1
→
2, 2
→
1, and 3
→
0.