USB97C100 Datasheet, PDF (23/64 Pages) SMSC Corporation – Multi-Endpoint USB Peripheral Controller

GPIO Direction Bit
(0x7F18[7:4])
GPIO out data
(0x7F19[7:4])
GPIO in data
(0x7F1A[7:4])
GPIO[7:4]
8051 "T0 timer P3.4"
GPIO2 data out (0x7F19[2])
GPIO2 Dir (0x7F18[2])
GPIO2 data in (0x7F1A[2])
0
Internal SOF
S1
0X7F1B[2]
8051 "T1 timer P3.5"
GPIO3 data out (0x7F19[3])
GPIO3 Dir (0x7F18[3])
GPIO3 data in (0x7F1A[3])
0
S ^{1 Internal SOF}
0X7F1B[3]
GPIO0 data out (0x7F19[0])
GPIO0 Dir (0x7F18[0])
GPIO0 data in (0x7F1A[0])
RXD "Uart P3.0"
0
S1
"0"
0X7F1B[0]
GPIO1 data out (0x7F19[1])
0
TXD "Uart P3.1"
1S
0X7F1B[1]
GPIO1 Dir (0x7F18[1])
GPIO1 data in (0x7F1A[1])
FIGURE 3 - GPIO MUXING BLOCK DIAGRAM
Pin # 36
Pin # 37
Pin # 34
Pin # 35
SMSC DS – USB97C100
Page 23
Rev. 01/03/2001