CP3BT23_14 Datasheet, PDF (262/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
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Figure 26-3 illustrates the configuration of a timer subsystem while operating in dual 8-bit PWM mode. The
numbering in Figure 26-3 refers to timer subsystem 1 but equally applies to the other three timer
subsystems.
7
0
C1PRSC
==
Prescaler
Counter
TMOD1 = 01
T2RUN
T1RUN
15
Res ^{COUNT1_n[15:8]}
0
[15:8]
Compare
PERCAP1_n[15:8]
Compare
DTYCAP1_n[15:8]
7
Res ^{COUNT1_n[7:0]}
Compare
PERCAP1_n[7:0]
0
[7:0]
Compare
DTYCAP1_n[7:0]
RQ
S
RQ
S
P2POL
TIOn_2
P1POL
TIOn_1
DS355
Figure 26-3. VTU Dual 8-Bit PWM Mode
26.1.2 16-Bit PWM Mode
Each of the four timer subsystems may be independently configured to provide a single 16-bit PWM
channel. In this case the lower and upper bytes of the counter are concatenated to form a single 16-bit
counter.
Operation in 16-bit PWM mode is conceptually identical to the dual 8-bit PWM operation as outlined under
"Dual 8-bit PWM Mode". The 16-bit timer may be started or stopped with the lower MODE.TxRUN bit, i.e.
T1RUN for timer subsystem 1.
The two TIOx outputs associated with a timer subsystem can be used to produce either two identical
PWM waveforms or two PWM waveforms of opposite polarities. This can be accomplished by setting the
two PxPOL bits of the respective timer subsystem to either identical or opposite values.
Figure 26-4 illustrates the configuration of a timer subsystem while operating in 16-bit PWM mode. The
numbering in Figure 26-4 refers to timer subsystem 1 but equally applies to the other three timer
subsystems.
7
0
C1PRSC
==
Prescaler
Counter
TMOD1 = 10
15
Restart
T1RUN
COUNT1_n[15:0]
Compare
PERCAP1_n[15:0]
Compare
DTYCAP1_n[15:0]
0
[15:0]
RQ
S
RQ
S
P2POL
TIOn_2
P1POL
TIOn_1
DS356
Figure 26-4. VTU 16-bit PWM Mode
262 Versatile Timer Unit (VTU)
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