LM3S5632 Luminary Micro, Inc, LM3S5632 Datasheet - Page 341

• Manufacturer Part Number: LM3S5632
• Description: Lm3s5632 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

13.1
13.2
13.2.1
June 02, 2008
Block Diagram
Figure 13-1. 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 13-1 on page 341 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 13-1. Samples and FIFO Depth of Sequencers
Sequencer
SS0 Interrupt
SS1 Interrupt
SS2 Interrupt
SS3 Interrupt
Comparator
GPIO (PB4)
Comparator
GPIO (PB4)
Comparator
GPIO (PB4)
Comparator
GPIO (PB4)
SS3
SS2
SS1
SS0
Timer
PWM
Timer
PWM
Timer
PWM
Timer
PWM
Trigger Events
Number of Samples
®
ADC collects sample data by using a programmable sequence-based approach
ADCEMUX
ADCPSSI
1
4
4
8
SS3
SS2
SS1
SS0
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
LM3S5632 Microcontroller
Hardware Averager
Analog-to-Digital
ADCSSFIFO0
ADCSSFIFO1
ADCSSFIFO2
ADCSSFIFO3
FIFO Block
Converter
ADCSAC
341