TMS320DM355 datasheet(145/153 Pages) TI

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5.16

Pulse Width Modulator (PWM)

5.16.1 PWM0/1/2/3 Electrical/Timing Data

PWM0/1/2/3

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

The DM355 contains 4 separate Pulse Width Modulator (PWM) modules. The pulse width modulator

(PWM) feature is very common in embedded systems. It provides a way to generate a pulse periodic

waveform for motor control or can act as a digital-to-analog converter with some external components.

This PWM peripheral is basically a timer with a period counter and a first-phase duration comparator,

where bit width of the period and first-phase duration are both programmable. The Pulse Width Modulator

(PWM) modules support the following features:

• 32-bit period counter

• 32-bit first-phase duration counter

• 8-bit repeat count for one-shot operation. One-shot operation will produce N + 1 periods of the

waveform, where N is the repeat counter value.

• Configurable to operate in either one-shot or continuous mode

• Buffered period and first-phase duration registers

• One-shot operation triggerable by hardware events with programmable edge transitions. (low-to-high or

high-to-low).

• One-shot operation triggerable by the CCD VSYNC output of the video processing subsystem (VPSS),

which allows any of the PWM instantiations to be used as a CCD timer. This allows the DM355 module

to support the functions provided by the DM320 CCD timer feature (generating strobe and shutter

signals).

• One-shot operation generates N+1 periods of waveform, N being the repeat count register value

• Configurable PWM output pin inactive state

• Interrupt and EDMA synchronization events

Table 5-46. Switching Characteristics Over Recommended Operating Conditions for PWM0/1/2/3

Outputs(1) (see Figure 5-47 and Figure 5-48)

DM355

NO.

PARAMETER

UNIT

MIN

MAX

tw(PWMH)

Pulse duration, PWMx high

tw(PWML)

Pulse duration, PWMx low

tt(PWM)

Transition time, PWMx

.05P

td(CCDC-PWMV)

Delay time, CCDC(VD) trigger event to PWMx valid

(1)

P = MXI1/CLKIN cycle time in ns. For example, when MXI1/CLKIN frequency is 24 MHz use P = 41.6 ns.

Figure 5-47. PWM Output Timing

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