LM3S1N16 Datasheet, PDF (507/794 Pages) Texas Instruments – Stellaris® LM3S1N16 Microcontroller

Stellaris^® LM3S1N16 Microcontroller
12.1
Block Diagram
Figure 12-1 on page 507 provides details on the internal configuration of the ADC controls and data
registers.
Figure 12-1. ADC Module Block Diagram
Internal
Voltage Ref
Trigger Events
Comparator
GPIO (PB4)
Timer
SS3
PWM
Comparator
GPIO (PB4)
Timer
SS2
PWM
Comparator
GPIO (PB4)
Timer
SS1
PWM
Control/Status
ADCACTSS
ADCOSTAT
ADCUSTAT
ADCSSPRI
ADCCTL
ADCSPC
Comparator
GPIO (PB4)
Timer
SS0
PWM
SS0 Interrupt
SS1 Interrupt
SS2 Interrupt
SS3 Interrupt
ADCEMUX
ADCPSSI
PWM Trigger
Interrupt Control
ADCIM
ADCRIS
ADCISC
ADCDCISC
Sample
Sequencer 0
ADCSSMUX0
ADCSSCTL0
ADCSSFSTAT0
Sample
Sequencer 1
ADCSSMUX1
ADCSSCTL1
ADCSSFSTAT1
Sample
Sequencer 2
ADCSSMUX2
ADCSSCTL2
ADCSSFSTAT2
Sample
Sequencer 3
ADCSSMUX3
ADCSSCTL3
ADCSSFSTAT3
Analog-to-Digital
Converter
External
Voltage Ref
(VREFA)
Analog Inputs
(AINx)
Hardware Averager
ADCSAC
FIFO Block
ADCSSFIFO0
ADCSSFIFO1
ADCSSFIFO2
ADCSSFIFO3
Digital
Comparator
ADCSSOPn
ADCSSDCn
ADCDCCTLn
ADCDCCMPn
ADCDCRIC
DC Interrupts
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 385.
Table 12-1. ADC Signals (64LQFP)
Pin Name
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
Pin Number Pin Mux / Pin
Assignment
1
PE3
2
PE2
5
PE1
6
PE0
64
PD3
63
PD2
Pin Type
I
I
I
I
I
I
Buffer Type^a Description
Analog
Analog
Analog
Analog
Analog
Analog
Analog-to-digital converter input 0.
Analog-to-digital converter input 1.
Analog-to-digital converter input 2.
Analog-to-digital converter input 3.
Analog-to-digital converter input 4.
Analog-to-digital converter input 5.
January 21, 2012
507
Texas Instruments-Production Data