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ADC12 Operation
17-8
ADC12
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.
The sampling timer keeps SAMPCON high after synchronization with
AD12CLK for a programmed interval t
sample
. The total sampling time is t
sample
plus t
sync
. See Figure 17−4.
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
Start
Sampling
Stop
Sampling
Conversion
Complete
SAMPCON
SHI
t
sample
t
convert
t
sync
13 x ADC12CLK
Start
Conversion
ADC12CLK