Texas Instruments MSP430x1xx User Manual

Page 307

Conversion Modes

15-17

ADC12

An illustration of repeat-single-channel mode is shown in Figure 15–11.

Figure 15–11.Repeat-Single-Channel Mode

ADC12

off

x = CStartAdd

Wait for Enable

ENC =

Wait for Trigger

Sample, Input

Channel Defined in

ADC12MCTLx

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 = 2

MSC = 1

and

SHP = 1

and

ENC = 1

ENC = 0

(MSC = 0

SHP = 0)

and

ENC = 1

15.5.4 Repeat-Sequence-of-Channels Mode

The repeat-sequence-of-channel mode is identical to the sequence-of-
channel mode, except the sequence is repeated continuously until stopped by
software. Each time a conversion is completed, the results are loaded into the
appropriate ADC12MEMx register and the corresponding interrupt flag
ADC12IFG.x is set to indicate completion of the conversion. Additionally, If the
appropriate interrupt-enable flags are set, an interrupt request is generated
(see the

ADC12 Interrupt Vector Register ADC12IV section).

The conversion mode may be changed without first stopping the conversions.
When this is done, the new mode takes effect after the current sequence com-