TI中文支持网Part Number:TMS320F280049C
你好，我最近在学习280049的ECAP，在ECAP输入选择那部分有一个源是EACPx_DELAY_CLK，请问这个信号是从那里来的。
Daniel：
您好
https://www.ti.com.cn/cn/lit/ug/sprui33h/sprui33h.pdf
TRM第2158页，这部分说明同步时出现的延迟可以外部时钟给。
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yingyingyingsiki：
感谢您的回复
您说的外部时钟指的是哪个时钟？
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Daniel：
您好
for eCAP can be either software sync-in or external sync-in. The external sync-in signal can come from EPWM, eCAP, or X-Bar. The SWSYNC of the eCAP module is logical ORed with the SYNC signal as shown in Figure 19-7. The SYNC signal is defined by the selection of SYNCSELECT[ECAPxSYNCIN] as shown in Figure 19-8. Note If SWSYNC is forced from ECAPx, then the Sync pulse is delayed by one clock cycle for sync pulse receiving ECAPs . This cycle delay/lag for the sync pulse receiving ECAPs can be corrected with the CTRPHS register. If there is an external SYNC signal, then all ECAPs see the signal at the same time.
请您参考这个官方TRM原文对于这个外部信号的说明。
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yingyingyingsiki：
好的 非常感谢您的解答
