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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C5122DS-RDRUM датащи(PDF) 110 Page - ATMEL Corporation |
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AT89C5122DS-RDRUM датащи(HTML) 110 Page - ATMEL Corporation |
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110 / 208 page  110 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Figure 58. Example of a Suspend/Resume Management Warning: The core must be switched in external clock mode before disabling the PLL. 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 equ est: DEVICE_REMOTE_WAKEUP, the firmware should set to 1 the RMWUPE bit in the USBCON register to enable this function. 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 5 ms. When the upstream resume is com- pleted, the UPRSM bit is reset to 0 by hardware. The firmware should then clear the SDRMWUP bit. USB Controller Init Detection of a SUSPEND State SPINT Set SUSPCLK Disable PLL microcontroller in power-down Detection of a RESUME State WUPCPU Enable PLL Clear SUSPCLK Clear WUPCPU bit Clear SPINT Note : WUPCPU bit must be Cleared before enabling the PLL Put the USB pads in power down mode |
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