at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 88

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Power modes
Idle Mode
Power Down
Freeze Clock
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AT85C51SND3B
There are 2 kinds of interrupts: processing (i.e. their generation are part of the normal
processing) and exception (errors).
Processing interrupts are generated when the following events are triggered:
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Exception Interrupts are generated when the following events are triggered:
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In this mode, the CPU core is halted (CPU clock stopped). The Idle mode is taken
regardless of the USB controller state (running or not). The CPU wakes up on any USB
interrupts.
In this mode, the oscillator and PLL are stopped and the CPU and peripherals are fro-
zen. The CPU “wakes up” when:
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The firmware has the ability to reduce the power consumption by setting the FRZCLK
bit, which freezes the clock of USB controller. When FRZCLK is set, it is still possible to
have an access to the following registers:
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Moreover, when FRZCLK is set, only the following interrupts may be triggered:
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IDTI: ID Pad detection (insert, remove)
VBUSTI: VBUS plug-in detection (insert, remove)
SRPI: SRP detected
ROLEEXI: Role Exchanged
VBERRI: Drop on VBUS Detected
BCERRI: Error during the B-Connection
HNPERRI: HNP Error
STOI: Time-out detected during Suspend mode
the WAKEUPI interrupt is triggered in the Peripheral mode (HOST cleared),
the RXRSMI or the SRPI interrupt is triggered in the Host mode (HOST set).
the IDTI interrupt is triggered
the VBUSTI interrupt is triggered
USBCON, USBSTA, USBINT
DPRAM direct access (DPADD10:0, UxDATX)
UDCON (detach, …)
UDINT
UDIEN
UHCON
UHINT
UHIEN
WAKEUPI
IDTI
VBUSTI
7632D–MP3–01/07