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STR720 데이터시트(PDF) 288 Page - STMicroelectronics

부품명 STR720
상세설명  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
PDF  401 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR720 데이터시트(HTML) 288 Page - STMicroelectronics

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STR720 - USB SLAVE INTERFACE (USB)
288/401
USB Frame Number Register (USB_FNR)
Address Offset: 48h
Reset Value: 0000 0xxx xxxx xxxx (0xxxh)
15
14
13
12
11
10
9
8
76
54321
0
LSOF[1:0]
FN[10:0]
rr
r
r
r
Bit 15
RXDP Receive Data + Line Status
This bit can be used to observe the status of received data plus upstream
port data line. It can be used during end-of-suspend routines to help
determining the wake-up event.
Bit 14
RXDM. Receive Data - Line Status
This bit can be used to observe the status of received data minus
upstream port data line. It can be used during end-of-suspend routines to
help determining the wake-up event.
Bit 13
LCK: Locked
This bit is set by the hardware when at least two consecutive SOF packets
have been received after the end of an USB reset condition or after the
end of an USB resume sequence. Once locked, the frame timer remains
in this state until an USB reset or USB suspend event occurs.
Bits12:11
LSOF[1:0]: Lost SOF
These bits are written by the hardware when an ESOF interrupt is
generated, counting the number of consecutive SOF packets lost. At the
reception of an SOF packet, these bits are cleared.
Bits 10:0
FN[10:0]: Frame Number
This bit field contains the 11-bits frame number contained in the last
received SOF packet. The frame number is incremented for every frame
sent by the host and it is useful for Isochronous transfers. This bit field is
updated on the generation of an SOF interrupt.
1



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