LM3S2793 Datasheet, PDF (1007/1194 Pages) Texas Instruments – Stellaris® LM3S2793 Microcontroller

Stellaris^® LM3S2793 Microcontroller
Register 52: PWM0 Dead-Band Control (PWM0DBCTL), offset 0x068
Register 53: PWM1 Dead-Band Control (PWM1DBCTL), offset 0x0A8
Register 54: PWM2 Dead-Band Control (PWM2DBCTL), offset 0x0E8
Register 55: PWM3 Dead-Band Control (PWM3DBCTL), offset 0x128
The PWMnDBCTL register controls the dead-band generator, which produces the PWMn signals
based on the pwmA and pwmB signals. When disabled, the pwmA signal passes through to the
pwmA' signal and the pwmB signal passes through to the pwmB' signal. When dead-band control
is enabled, the pwmB signal is ignored, the pwmA' signal is generated by delaying the rising edge(s)
of the pwmA signal by the value in the PWMnDBRISE register (see page 1008), and the pwmB' signal
is generated by inverting the pwmA signal and delaying the falling edge(s) of the pwmA signal by
the value in the PWMnDBFALL register (see page 1009). The Output Control block outputs the pwm0A'
signal on the PWM0 signal and the pwm0B' signal on the PWM1 signal. In a similar manner, PWM2
and PWM3 are produced from the pwm1A' and pwm1B' signals, PWM4 and PWM5 are produced from
the pwm2A' and pwm2B' signals, and PWM6 and PWM7 are produced from the pwm3A' and pwm3B'
signals.
If the Dead-Band Control mode is immediate (based on the DBCTLUPD field encoding in the
PWMnCTL register), the ENABLE bit value is used immediately. If the update mode is locally
synchronized, this value is used the next time the counter reaches zero. If the update mode is
globally synchronized, this value is used the next time the counter reaches zero after a synchronous
update has been requested through the PWM Master Control (PWMCTL) register (see page 960).
If this register is rewritten before the actual update occurs, the previous value is never used and is
lost.
PWM0 Dead-Band Control (PWM0DBCTL)
PWM0 base: 0x4002.8000
Offset 0x068
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
ENABLE
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:1
0
Name
reserved
ENABLE
Type
Reset Description
RO 0x0000.000 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
R/W
0
Dead-Band Generator Enable
Value Description
1 The dead-band generator modifies the pwmA signal by inserting
dead bands into the pwmA' and pwmB' signals.
0 The pwmA and pwmB signals pass through to the pwmA' and
pwmB' signals unmodified.
January 20, 2012
Texas Instruments-Production Data
1007