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USB97C100QFP Datenblatt(PDF) 22 Page - SMSC Corporation |
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USB97C100QFP Datenblatt(HTML) 22 Page - SMSC Corporation |
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22 / 64 page ![]() SMSC DS – USB97C100 Page 22 Rev. 01/03/2001 Table 26 - Utility Configuration Register UTIL_CONFIG (0x7F1B- RESET=0x00) UTILITY CONFIGURATION REGISTER BIT NAME R/W DESCRIPTION [7:4] Reserved R Reserved 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' Notes: 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. 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. 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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