Figure 12-2. ADC Module Block Diagram
Analog Inputs
(AINx)
Trigger Events
SS0 Interrupt
SS1 Interrupt
SS2 Interrupt
SS3 Interrupt
ADCISC
ADCRIS
ADCIM
Interrupt Control
ADCDCISC
SS0
SS1
SS2
SS3
Comparator
GPIO (PB4)
Timer
PWM
Comparator
GPIO (PB4)
Timer
PWM
Comparator
GPIO (PB4)
Timer
PWM
Comparator
GPIO (PB4)
Timer
PWM
ADCEMUX
ADCPSSI
Control/Status
ADCUSTAT
ADCOSTAT
ADCACTSS
ADCSSPRI
Digital
Comparator
ADCSSOPn
ADCSSDCn
ADCDCCTLn
ADCDCCMPn
Analog-to-Digital
Converter
Hardware Averager
ADCSAC
ADCSSFSTAT0
ADCSSCTL0
ADCSSMUX0
Sample
Sequencer 0
ADCSSFSTAT1
ADCSSCTL1
ADCSSMUX1
Sample
Sequencer 1
ADCSSFSTAT2
ADCSSCTL2
ADCSSMUX2
Sample
Sequencer 2
ADCSSFSTAT3
ADCSSCTL3
ADCSSMUX3
Sample
Sequencer 3
PWM Trigger
DC Interrupts
Internal
Voltage Ref
External
Voltage Ref
(VREFA)
ADCCTL
ADCSPC
FIFO Block
ADCSSFIFO0
ADCSSFIFO1
ADCSSFIFO2
ADCSSFIFO3
ADCDCRIC
12.2 Signal Description
The following table lists the external signals of the ADC module and describes the function of each.
The ADC signals are analog functions for some GPIO signals. The column in the table below titled
"Pin Mux/Pin Assignment" lists the GPIO pin placement for the ADC signals. The AINx and VREFA
analog signals are not 5-V tolerant and go through an isolation circuit before reaching their circuitry.
These signals are configured by clearing the corresponding DEN bit in the GPIO Digital Enable
(GPIODEN) register and setting the corresponding AMSEL bit in the GPIO Analog Mode Select
(GPIOAMSEL) register. For more information on configuring GPIOs, see “General-Purpose
Input/Outputs (GPIOs)” on page 408.
Table 12-1. ADC Signals (100LQFP)
DescriptionBuffer Type
a
Pin TypePin Mux / Pin
Assignment
Pin NumberPin Name
Analog-to-digital converter input 0.AnalogIPE71AIN0
Analog-to-digital converter input 1.AnalogIPE62AIN1
Analog-to-digital converter input 2.AnalogIPE55AIN2
Analog-to-digital converter input 3.AnalogIPE46AIN3
Analog-to-digital converter input 4.AnalogIPD7100AIN4
Analog-to-digital converter input 5.AnalogIPD699AIN5
Analog-to-digital converter input 6.AnalogIPD596AIN6
Analog-to-digital converter input 7.AnalogIPD495AIN7
Analog-to-digital converter input 8.AnalogIPE375AIN8
Analog-to-digital converter input 9.AnalogIPE274AIN9
535July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.