参数资料
型号: M66291GP
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封装: 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 40/128页
文件大小: 928K
代理商: M66291GP
M66291GP/HP
Rev 1.01 2004.11.01 page 17 of 122
2.5 Isochronous Status Register
Isochronous Status Register (ISOCHRONOUS_STATUS)
<Address : H’0A>
b15
14
13
12
11
10
9876
54321
b0
FMOD
FRNM
0
000000
0
00000
0
000000
0
00000
-
------
<H/W reset : H'0000>
<S/W reset : H'0000>
<USB bus reset : ->
b
Bit name
Function
R
W
15~12
Reserved. Set it to “0”.
?0
11
FMOD
Frame Number Mode
0 :
At SOF receive
1 :
At Isochronous transfer complete
10~0
FRNM
Frame Number
Stores the frame number
×
This register is valid only for isochronous transfer. In other words, the register is valid status for the endpoint
that is set EPi_TYP bits to “11”.
(1) FMOD (Frame Number Mode) Bit (b11)
This bit sets the storage timing of the frame number to be stored to the FRNM bits.
When this bit is set to “0”, when the SOF packet is properly received, the frame number of the received SOF
packet gets stored.
When this bit is set to “1”, when the isochronous packet transfer completes, the frame number of the properly
received SOF packet gets stored.
(2) FRNM (Frame Number) Bits (b10~b0)
The frame number is stored in the FRNM with the timing set by the FMOD bit of this register. Here, the
SOFR bit is set to “1”.
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