Texas Instruments MSP430x1xx User Manual page 366

ADC12 Operation
Pulse Sample Mode
The pulse sample mode is selected when SHP = 1. The SHI signal is used to
trigger the sampling timer. The SHT0x and SHT1x bits in ADC12CTL0 control
the interval of the sampling timer that defines the SAMPCON sample period
t
sample.
AD12CLK for a programmed interval t
plus t
The SHTx bits select the sampling time in 4x multiples of ADC12CLK. SHT0x
selects the sampling time for ADC12MCTL0 to 7 and SHT1x selects the
sampling time for ADC12MCTL8 to 15.
Figure 17−4. Pulse Sample Mode
SHI
SAMPCON
ADC12CLK
17-8
ADC12
The sampling timer keeps SAMPCON high after synchronization with
. See Figure 17−4.
sync
Start Stop
Sampling Sampling
t sample
t sync
. The total sampling time is t
sample
Start Conversion
Conversion Complete
13 x ADC12CLK
t convert
sample