參數(shù)資料
型號: M66291GP
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封裝: LQFP-48
文件頁數(shù): 40/126頁
文件大?。?/td> 810K
代理商: M66291GP
MITSUBISHI <DIGITAL ASSP>
M66291GP
2. Registers
USB -16
Ver.1.0 Apr.9 2001
2.6 SOF Control Register
s
SOF Control Register (SOF_CNT)
<Address : H’0C>
b15
14
13
12
11
10
9876543
21
b0
SOFOE SOFA
00
0
00
0
--
-
<H/W reset : H'0000>
<S/W reset : H’0000>
<USB bus reset : ->
b
Bit name
Function
R
W
15
SOFOE
SOF Output Enable
0 :
Disable SOF signal output
1 :
Enable SOF signal output
14
SOFA
SOF Polarity
0 :
"L" active
1 :
"H" active
13~0
Reserved. Set it to “0”.
00
(1) SOFOE (SOF Output Enable) Bit (b15)
This bit sets the enable/disable of SOF signal output.
When this bit is set to “1”, if SOF packet is received, the INT1/SOF pin outputs SOF signal. The output polarity
is set by SOFA bit.
The SOF signal outputs the pulse (approx. 0.67 us) equivalent to 32 clocks of the 48 MHz clock after
receiving the PID field. Refer to Figure 2.4.
Since the INT1 pin is double-function pin, do not allocate the interrupt signal to this pin when using the
SOF signal (Set by the Polarity Set Register).
SYNC
PID
FLAME
CRC5
Fixed length
Approx. 0.67us
USB bus signal
SOF packet
("L" active)
SOF signal
Figure 2.4 SOF Signal Output Timing
(2) SOFA (SOF Polarity) Bit (b14)
This bit sets the output polarity of SOF signal.
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相關代理商/技術參數(shù)
參數(shù)描述
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