LM3S101 Datasheet, PDF (99/284 Pages) List of Unclassifed Manufacturers – Microcontroller

General-Purpose Input/Outputs (GPIOs)
Table 8-3.
GPIO Register Map
Offset Name
Reset
Type Description
See
page
0x500 GPIODR2R
0x000000FF R/W 2-mA drive select
110
0x504 GPIODR4R
0x00000000 R/W 4-mA drive select
111
0x508 GPIODR8R
0x00000000 R/W 8-mA drive select
112
0x50C GPIOODR
0x00000000 R/W Open drain select
113
0x510 GPIOPUR
0x000000FF R/W Pull-up select
114
0x514 GPIOPDR
0x00000000 R/W Pull-down select
115
0x518 GPIOSLR
0x00000000 R/W Slew rate control select
116
0x51C GPIODEN
0x000000FF R/W Digital input enable
117
0xFD0 GPIOPeriphID4 0x00000000 RO Peripheral identification 4
118
0xFD4 GPIOPeriphID5 0x00000000 RO Peripheral identification 5
119
0xFD8 GPIOPeriphID6 0x00000000 RO Peripheral identification 6
120
0xFDC GPIOPeriphID7 0x00000000 RO Peripheral identification 7
121
0xFE0 GPIOPeriphID0 0x00000061 RO Peripheral identification 0
122
0xFE4 GPIOPeriphID1 0x00000000 RO Peripheral identification 1
123
0xFE8 GPIOPeriphID2 0x00000018 RO Peripheral identification 2
124
0xFEC GPIOPeriphID3 0x00000001 RO Peripheral identification 3
125
0xFF0 GPIOPCellID0 0x0000000D RO GPIO PrimeCell identification 0
126
0xFF4 GPIOPCellID1 0x000000F0 RO GPIO PrimeCell identification 1
127
0xFF8 GPIOPCellID2 0x00000005 RO GPIO PrimeCell identification 2
128
0xFFC GPIOPCellID3 0x000000B1 RO GPIO PrimeCell identification 3
129
a. The default reset value for the GPIOAFSEL register is 0x00000000 for all GPIO pins, with the exception of the five JTAG pins
(PB7 and PC[3:0]. These five pins default to JTAG functionality. Because of this, the default reset value of GPIOAFSEL for
GPIO Port B is 0x00000080 while the default reset value of GPIOAFSEL for Port C is 0x0000000F.
8.5 Register Descriptions
The remainder of this section lists and describes the GPIO registers, in numerical order by
address offset.
99
March 22, 2006
Preliminary