參數(shù)資料
型號： UCD9501PZS
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號處理
英文描述： Digital Signal Processors
中文描述： 數(shù)字信號處理器
文件頁數(shù)： 50/123頁
文件大?。?/td> 1205K
代理商： UCD9501PZS
www.ti.com
CTR=PRD
TBPRD shadow (16)
TBPRD active (16)
Counter
up/down
(16 bit)
TBCNT
active (16)
TBCTL[CNTLDE]
TBCTL[SWFSYNC]
(software forced sync)
EPWMxSYNCI
CTR=ZERO
CTR=CMPB
Disabled
CTR_Dir
Sync
in/out
select
Mux
TBCTL[SYNCOSEL]
EPWMxSYNCO
TBPHS active (24)
16
8
TBPHSHR (8)
Phase
control
Timebase (TB)
CTR=CMPA
CMPAHR (8)
CMPA active (24)
16
CMPA shadow (24)
Action
qualifier
(AQ)
8
16
Counter compare (CC)
CMPB active (16)
CTR=CMPB
CMPB shadow (16)
EPWMA
EPWMB
Dead
band
(DB)
(PC)
chopper
PWM
zone
(TZ)
Trip
CTR = ZERO
EPWMxAO
EPWMxBO
EPWMxTZINT
TZ1 to TZ6
HiRes PWM (HRPWM)
CTR = PRD
CTR = ZERO
CTR = CMPA
CTR = CMPB
CTR_Dir
Event
trigger
and
interrupt
(ET)
EPWMxINT
EPWMxSOCA
EPWMxSOCB
CTR=ZERO
4.3
Hi-Resolution PWM (HRPWM)
TMS320F2808, TMS320F2806
TMS320F2801, UCD9501
Digital Signal Processors
SPRS230F–OCTOBER 2003–REVISED SEPTEMBER 2005
Figure 4-4. ePWM Sub-modules Showing Critical Internal Signal Interconects
The HRPWM module offers PWM resolution (time granularity) which is significantly better than what can
be achieved using conventionally derived digital PWM methods. The key points for the HRPWM module
are:
Significantly extends the time resolution capabilities of conventionally derived digital PWM
Typically used when effective PWM resolution falls below ~ 9-10 bits. This occurs at PWM frequencies
greater than ~200 KHz when using a CPU/System clock of 100 MHz.
This capability can be utilized in both duty cycle and phase-shift control methods.
Finer time granularity control or edge positioning is controlled via extensions to the Compare A and
Phase registers of the ePWM module.
HRPWM capabilities are offered only on the A signal path of an ePWM module (i.e., on the EPWMxA
output). EPWMxB output has conventional PWM capabilities.
Only PWM channels ePWM 1A, 2A, 3A, 4A support HRPWM features. The remaining ePWM
channels do not support the HRPWM features.
50
Peripherals
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