LM3S6918 Luminary Micro, Inc, LM3S6918 Datasheet - Page 268
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LM3S6918
Manufacturer Part Number
LM3S6918
Description
Lm3s6918 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S6918.pdf
(539 pages)
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Analog-to-Digital Converter (ADC)
12.1
12.2
12.2.1
268
Block Diagram
Figure 12-1. ADC Module Block Diagram
Functional Description
The Stellaris
instead of the traditional single or double-sampling approach found on many ADC modules. Each
sample sequence is a fully programmed series of consecutive (back-to-back) samples, allowing the
ADC to collect data from multiple input sources without having to be re-configured or serviced by
the controller. The programming of each sample in the sample sequence includes parameters such
as the input source and mode (differential versus single-ended input), interrupt generation on sample
completion, and the indicator for the last sample in the sequence.
Sample Sequencers
The sampling control and data capture is handled by the Sample Sequencers. All of the sequencers
are identical in implementation except for the number of samples that can be captured and the depth
of the FIFO. Table 12-1 on page 268 shows the maximum number of samples that each Sequencer
can capture and its corresponding FIFO depth. In this implementation, each FIFO entry is a 32-bit
word, with the lower 10 bits containing the conversion result.
Table 12-1. Samples and FIFO Depth of Sequencers
Sequencer
SS0 Interrupt
SS1 Interrupt
SS2 Interrupt
SS3 Interrupt
GPIO (PB4)
GPIO (PB4)
GPIO (PB4)
GPIO (PB4)
Comparator
Comparator
Comparator
Comparator
SS3
SS2
SS1
SS0
Timer
Timer
Timer
Timer
PWM
PWM
PWM
PWM
Trigger Events
Number of Samples
®
ADC collects sample data by using a programmable sequence-based approach
ADCEMUX
ADCPSSI
SS3
SS2
SS1
SS0
1
4
4
8
Depth of FIFO
Interrupt Control
Control/Status
ADCACTSS
ADCOSTAT
ADCUSTAT
ADCSSPRI
ADCRIS
ADCISC
ADCIM
1
4
4
8
Preliminary
ADCSSFSTAT0
ADCSSFSTAT1
ADCSSFSTAT2
ADCSSFSTAT3
ADCSSMUX0
ADCSSMUX1
ADCSSMUX2
ADCSSMUX3
ADCSSCTL0
ADCSSCTL1
ADCSSCTL2
ADCSSCTL3
Sequencer 0
Sequencer 1
Sequencer 2
Sequencer 3
Sample
Sample
Sample
Sample
Hardware Averager
Analog-to-Digital
ADCSSFIFO0
ADCSSFIFO1
ADCSSFIFO2
ADCSSFIFO3
FIFO Block
Converter
ADCSAC
July 26, 2008
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