LM3S2939 Datasheet, PDF (611/749 Pages) Texas Instruments – Stellaris® LM3S2939 Microcontroller

Stellaris^® LM3S2939 Microcontroller
Figure 17-2. PWM Module Block Diagram
PWM Generator Block
Interrupts /
Triggers
Control
PWMnCTL
Timer
zero
load
dir
PWMnLOAD
PWMnCOUNT
PWM Clock
Comparators
PWMnCMPA
PWMnCMPB
cmp A
cmp B
Interrupt and
Trigger
Generator
PWMnINTEN
PWMnRIS
PWMnISC
Signal
Generator
PWMnGENA
PWMnGENB
Fault
Condition
PWMnFLTSRC0
PWMnMINFLTPER
PWMnFLTSEN
PWMnFLTSTAT0
Fault(s)
PWMn_Fault
Dead-Band
Generator
PWMnDBCTL
PWMnDBRISE
PWMnDBFALL
PWMn_A
PWMn_B
17.2
Signal Description
Table 17-1 on page 611 and Table 17-2 on page 611 list the external signals of the PWM module and
describe the function of each. The PWM controller signals are alternate functions for some GPIO
signals and default to be GPIO signals at reset. The column in the table below titled "Pin Assignment"
lists the possible GPIO pin placements for these PWM signals. The AFSEL bit in the GPIO Alternate
Function Select (GPIOAFSEL) register (page 309) should be set to choose the PWM function. For
more information on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 285.
Table 17-1. PWM Signals (100LQFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
Fault
99
I
TTL
PWM Fault.
PWM0
47
O
TTL
PWM 0. This signal is controlled by PWM Generator 0.
PWM1
61
O
TTL
PWM 1. This signal is controlled by PWM Generator 0.
PWM2
86
O
TTL
PWM 2. This signal is controlled by PWM Generator 1.
PWM3
85
O
TTL
PWM 3. This signal is controlled by PWM Generator 1.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 17-2. PWM Signals (108BGA)
Pin Name
Pin Number Pin Type Buffer Type^a Description
Fault
F2
I
TTL
PWM Fault.
PWM0
M9
O
TTL
PWM 0. This signal is controlled by PWM Generator 0.
PWM1
H12
O
TTL
PWM 1. This signal is controlled by PWM Generator 0.
PWM2
C9
O
TTL
PWM 2. This signal is controlled by PWM Generator 1.
PWM3
C8
O
TTL
PWM 3. This signal is controlled by PWM Generator 1.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
June 18, 2012
611
Texas Instruments-Production Data