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| 型號(hào)： | AT43USB355M-AU |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Full-speed USB Microcontroller with Embedded Hub, ADC and PWM |
| 中文描述： | 8-BIT, MROM, 12 MHz, RISC MICROCONTROLLER, PQFP64 |
| 封裝： | 1.40 MM, GREEN, PLASTIC, MS-026ACB, LQFP-64 |
| 文件頁(yè)數(shù)： | 31/115頁(yè) |
| 文件大?。?/td> | 610K |
| 代理商： | AT43USB355M-AU |
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31
AT43USB355
2603G–USB–04/06
USB Interrupt
Sources
The USB interrupts are described below.
All interrupts have individual enable, status, and mask bits through the interrupt enable regis-
ter and interrupt mask register. The Suspend and Resume interrupts are cleared by writing a 0
to the particular interrupt bit. All other interrupts are cleared when the microcontroller sets a bit
in an interrupt acknowledge register.
Table 9.
USB Interrupt Sources
Interrupt
Description
SOF Received
Whenever USB hardware decodes a valid Start of Frame. The
frame number is stored in the two Frame Number Registers.
EOF2
Activated whenever the hub's frame timer reaches its EOF2 time
point.
Function EP0 Interrupt
See “Control Transfers at Control End-point EP0” on page 75 for
details.
Function EP1 Interrupt
For an OUT end-point it indicates that Function End-point 1 has
received a valid OUT packet and that the data is in the FIFO. For
an IN end-point it means that the end-point has received an IN
token, sent out the data in the FIFO and received an ACK from the
Host. The FIFO is now ready to be written by new data from the
microcontroller.
Function EP2 Interrupt
For an OUT end-point it indicates that Function End-point 2 has
received a valid OUT packet and that the data is in the FIFO. For
an IN end-point it means that the end-point has received an IN
token, sent out the data in the FIFO and received an ACK from the
Host. The FIFO is now ready to be written by new data from the
microcontroller.
Function EP3 Interrupt
For an OUT end-point it indicates that Function End-point 3 has
received a valid OUT packet and that the data is in the FIFO. For
an IN end-point it means that the end-point has received an IN
token, sent out the data in the FIFO and received an ACK from the
Host. The FIFO is now ready to be written by new data from the
microcontroller.
Hub EP0 Interrupt
See “Control Transfers at Control End-point EP0” on page 75 for
details.
FRWUP
USB hardware has received a embedded function remote wakeup
request.
GLB SUSP
USB hardware has received global suspend signaling and is
preparing to put the hub in the suspend mode. The
microcontroller's firmware should place the embedded function in
the suspend state.
RSM
USB hardware received resume signaling and is propagating the
resume signaling. The microcontroller's firmware should take the
embedded function out of the suspended state.
BUS RESET
USB hardware received a USB bus reset. This applies only in
cases where a separation between USB bus reset and
microcontroller reset is required. Be very careful when using this
feature.
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