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产生非对称性不规则pwm,求助大神解答

波形.docx

wentao zhang:我想要产生开关Sb的波形,求大神指点

波形.docx

Eric Ma:

回复 wentao zhang:

你可以看看F2837X的PWM模块,用Trigger Events 配合CMPA, CMPB进行设置。
14.6.1 Purpose of the Action-Qualifier Submodule
The action-qualifier submodule is responsible for the following:
• Qualifying and generating actions (set, clear, toggle) based on the following events:
– CTR = PRD: Time-base counter equal to the period (TBCTR = TBPRD).
– CTR = Zero: Time-base counter equal to zero (TBCTR = 0x00)
– CTR = CMPA: Time-base counter equal to the counter-compare A register (TBCTR = CMPA)
– CTR = CMPB: Time-base counter equal to the counter-compare B register (TBCTR = CMPB)
• T1, T2 events: Trigger events based on comparator, trip or syncin events
• Managing priority when these events occur concurrently
• Providing independent control of events when the time-base counter is increasing and when it is
decreasing

波形.docx

wentao zhang:

回复 Eric Ma:

COMPARATOR 只是外部模拟信号比较,trip也是外部信号相关,程序内部变量产生T1,T2 events的话,请问有哪些方法呢

波形.docx

Eric Ma:

回复 wentao zhang:

如果不借助外部信号,我目前想不到其他的方法。

ERIC

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