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USB97C102 датащи(PDF) 24 Page - SMSC Corporation

номер детали USB97C102
подробное описание детали  Multi-Endpoint USB Peripheral Controller with Integrated 5 Port HUB
PDF  80 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB97C102 датащи(HTML) 24 Page - SMSC Corporation

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SMSC DS – USB97C102
Page 24
Rev. 03/23/2000
Table 28 - Utility Configuration Register
UTIL_CONFIG
(0x7F1B- RESET=0x00)
UTILITY CONFIGURATION REGISTER
BIT
NAME
R/W
DESCRIPTION
[7:5]
Reserved
R
Reserved
4
GPIO4/SOF
R/W
GPIO4/SOF Output Select Mux
0 = GPIO4
1 = SOF port
3
GPIO3/T1
R/W
P3.5 Timer 1 input trigger source
0 = GPIO3
1 = SOF FRAME write strobe
2
GPIO2/T0
R/W
P3.4 Timer 0 input trigger source
0 = GPIO2
1 = SOF FRAME write strobe
1
GPIO1/TXD
R/W
GPIO1/TXD Output Select Mux
0 = GPIO1
1 = P3.1
0
GPIO0/RXD
R/W
P3.0 RXD/GPIO0 Input Select Mux
0 = RXD<=GPIO0
1 = RXD<='0'
Note 1: In Counter mode, the 8051 must sample T[1:0] as a '1' in one instruction cycle, and then '0' in the next. So
for 12MHz, the SOF Pulse must be active for at least 1us.
Note 2: Missing SOF packets can be reconstructed by using the Timer mode to count the number of 8051 instruction
cycles since the last valid Frame was received.
Note 3: A GPIO can be used to output nSOF pulses. This can be done by configuring a GPIO as an output and
writing to the GPIO out register to generate low pulses each time a SOF packet is received.



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