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AT83SND1CXXX-ROTIL 데이터시트(PDF) 94 Page - ATMEL Corporation

부품명 AT83SND1CXXX-ROTIL
상세설명  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTIL 데이터시트(HTML) 94 Page - ATMEL Corporation

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4109J–8051–10/06
AT8xC51SND1C
The firmware has to clear the SPINT bit in the USBINT register before any other USB operation
in order to wake up the USB controller from its Suspend mode.
The USB controller is then re-activated.
Figure 14-13. Example of a Suspend/Resume Management
14.8.3
Upstream Resume
A USB device can be allowed by the Host to send an upstream resume for Remote Wake-up
purpose.
When the USB controller receives the SET_FEATURE request: DEVICE_REMOTE_WAKEUP,
the firmware should set to 1 the RMWUPE bit in the USBCON register to enable this functional-
ity. 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 clear-
ing first the SPINT bit in the USBINT register and by setting then to 1 the SDRMWUP 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 completed, 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



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