AT83C5135 Atmel Corporation, AT83C5135 Datasheet - Page 116

• Manufacturer Part Number: AT83C5135
• Manufacturer: Atmel Corporation

Specifications of AT83C5135

• Max. Operating Frequency: 32 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 512
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 4
• Mask Rom (kbytes): 16
• Watchdog: Yes

21.8.3
Figure 21-12. Example of REMOTE WAKEUP Management
116
AT83C5134/35/36
Upstream Resume
SET_FEATURE: DEVICE_REMOTE_WAKEUP
Detection of a SUSPEND State
Upstream RESUME Sent
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 will set to 1 the RMWUPE bit in the USBCON 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 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 5 ms. When the upstream resume is completed, the UPRSM bit is reset to 0 by
hardware. The firmware will then clear the SDRMWUP bit.
UPRSM = 1
SPINT
UPRSM
Suspend Management
USB Controller Init
Clear SDRMWUP
Set SDMWUP
Set RMWUPE
Enable Clocks
Clear SPINT
Need USB Resume
7683C–USB–11/07