CP3SP33SMSSLASHNOPB datasheet(337/407 Pages) TI1

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COUNT1_n[15:8]

Res

[15:8]

P2POL

TIOn_2

PERCAP1_n[15:8]

Compare

DTYCAP1_n[15:8]

Compare

C1PRSC

= =

Prescaler

Counter

COUNT1_n[7:0]

Res

[7:0]

P1POL

TIOn_1

PERCAP1_n[7:0]

Compare

DTYCAP1_n[7:0]

Compare

T1RUN

TMOD1 = 01

T2RUN

DS355

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

The two I/O pins associated with a timer subsystem function are independent PWM outputs in the dual 8-

bit PWM mode. If a PWM timer is stopped using its associated MODE_n.TxRUN bit the following actions

result:

•

The associated TIOn_y pin will return to its default value as defined by the IOxCTL_n.PxPOL bit.

•

The counter will stop and will retain its last value.

•

Any pending updates of the PERCAPx_n and DTYCAPx_n register will be completed.

•

The prescaler counter will be stopped and reset if both MODE_n.TxRUN bits are cleared.

Figure 33-3 illustrates the configuration of a timer subsystem while operating in dual 8-bit PWM mode. The

numbering in Figure 33-3 refers to timer subsystem 1 but equally applies to the other three timer

subsystems.

Figure 33-3. VTU Dual 8-Bit PWM Mode

33.1.2 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 on page 254. The 16-bit timer may be started or stopped with the lower

MODE_n.TxRUN bit, i.e., T1RUN for timer subsystem 1.

The two TIOn_y 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 33-4 illustrates the configuration of a timer subsystem while operating in 16-bit PWM mode. The

numbering in Figure 33-4 refers to timer subsystem 1 but equally applies to the other three timer

subsystems.

Dual Versatile Timer Units (VTU)

337

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