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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C5131A-RDTIM датащи(PDF) 133 Page - ATMEL Corporation |
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AT89C5131A-RDTIM датащи(HTML) 133 Page - ATMEL Corporation |
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133 / 184 page  133 AT89C5130A/31A-M 4337C–USB–02/05 Upstream Resume A USB device can be allowed by the Host to send an upstream resume for Remote Wake Up purpose. Whe n t he U SB co ntr o ll er r e ceive s th e SET _F EAT URE r e qu est: DEVICE_REMOTE_WAKEUP, the firmware will set to 1 the RMWUPE bit in the USB- CON register to enable this functionality. RMWUPE value will 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 5 ms. When the upstream resume is com- pleted, the UPRSM bit is reset to 0 by hardware. The firmware will then clear the SDRMWUP bit. Figure 64. 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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