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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT83SND2CMP3 датащи(PDF) 48 Page - ATMEL Corporation |
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AT83SND2CMP3 датащи(HTML) 48 Page - ATMEL Corporation |
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48 / 97 page  48 AT83SND2CMP3 7524B–MP3–05/06 Upstream Resume A USB device can be allowed by the Host to send an upstream resume for Remote Wake-up purpose. W h e n t he US B c o nt r o l l er r e c e i v es t he S E T _F E A T URE r e q ues t : DEVICE_REMOTE_WAKEUP, the firmware should set to 1 the RMWUPE bit in the USBCON register to enable this functionality. RMWUPE value should be 0 in the other cases. If the device is in SUSPEND mode, the USB controller can send an upstream resume by clearing first the SPINT bit in the USBINT register and by setting then to 1 the SDRM- WUP bit in the USBCON register. The USB controller sets to 1 the UPRSM bit in the USBCON register. All clocks must be enabled first. The Remote Wake is sent only if the USB bus was in Suspend state for at least 5ms. When the upstream resume is com- pleted, the UPRSM bit is reset to 0 by hardware. The firmware should then clear the SDRMWUP bit. Figure 34. Example of REMOTE WAKEUP Management USB Controller Init Detection of a SUSPEND state SPINT Set RMWUPE Suspend Management enable clocks upstream RESUME sent UPRSM Clear SPINT Set SDMWUP Clear SDRMWUP SET_FEATURE: DEVICE_REMOTE_WAKEUP need USB resume UPRSM = 1 |
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