參數(shù)資料
型號: TMS320DM355_07
廠商: Texas Instruments, Inc.
英文描述: Digital Media System-on-Chip (DMSoC)
中文描述: 數(shù)字媒體系統(tǒng)芯片(DMSoC)
文件頁數(shù): 146/158頁
文件大?。?/td> 1319K
代理商: TMS320DM355_07
www.ti.com
P
5.16
Pulse Width Modulator (PWM)
5.16.1 PWM0/1/2/3 Electrical/Timing Data
PWM0/1/2/3
1
3
3
2
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 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
MIN
P
P
NO.
PARAMETER
UNIT
MAX
1
2
3
4
t
w(PWMH)
t
w(PWML)
t
t(PWM)
t
d(CCDC-PWMV)
Pulse duration, PWMx high
Pulse duration, PWMx low
Transition time, PWMx
Delay time, CCDC(VD) trigger event to PWMx valid
ns
ns
ns
ns
.05P
10
(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
DM355 Peripheral Information and Electrical Specifications
146
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