General-Purpose Input/Output (GPIO)
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SPRUI07–March 2020
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System Control and Interrupts
Figure 1-61. GPIO Port C Direction (GPCDIR) Register
31 24
Reserved
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
23 22 21 20 19 18 17 16
GPIO87 GPIO86 GPIO85 GPIO84 GPIO83 GPIO82 GPIO81 GPIO80
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
15 14 13 12 11 10 9 8
GPIO79 GPIO78 GPIO77 GPIO76 GPIO75 GPIO74 GPIO73 GPIO72
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
7 6 5 4 3 2 1 0
GPIO71 GPIO70 GPIO69 GPIO68 GPIO67 GPIO66 GPIO65 GPIO64
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
(1)
This register is EALLOW protected. See Section 1.5.2 for more information.
Table 1-64. GPIO Port C Direction (GPCDIR) Register Field Descriptions
Bits Field Value Description
(1)
31-0 GPIO87-GPIO64 Controls direction of GPIO pin when GPIO mode is selected. Reading the register returns the
current value of the register setting
0 Configures the GPIO pin as an input. (default)
1 Configures the GPIO pin as an output
The pullup disable (GPxPUD) registers allow you to specify which pins should have an internal pullup
resister enabled. The internal pullups on the pins that can be configured as ePWM outputs(GPIO0-
GPIO11) are all disabled asynchronously when the external reset signal (XRS) is low. The internal pullups
on all other pins are enabled on reset. When coming out of reset, the pullups remain in their default state
until you enable or disable them selectively in software by writing to this register. The pullup configuration
applies both to pins configured as I/O and those configured as peripheral functions.
Figure 1-62. GPIO Port A Pullup Disable (GPAPUD) Registers
31 30 29 28 27 26 25 24
GPIO31 GPIO30 GPIO29 GPIO28 GPIO27 GPIO26 GPIO25 GPIO24
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
23 22 21 20 19 18 17 16
GPIO23 GPIO22 GPIO21 GPIO20 GPIO19 GPIO18 GPIO17 GPIO16
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
15 14 13 12 11 10 9 8
GPIO15 GPIO14 GPIO13 GPIO12 GPIO11 GPIO10 GPIO9 GPIO8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1 R/W-1 R/W-1
7 6 5 4 3 2 1 0
GPIO7 GPIO6 GPIO5 GPIO4 GPIO3 GPIO2 GPIO1 GPIO0
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
(1)
This register is EALLOW protected. See Section 1.5.2 for more information.
Table 1-65. GPIO Port A Internal Pullup Disable (GPAPUD) Register Field Descriptions
Bits Field Value Description
(1)
31-0 GPIO31-GPIO0 Configure the internal pullup resister on the selected GPIO Port A pin. Each GPIO pin
corresponds to one bit in this register.
0 Enable the internal pullup on the specified pin. (default for GPIO12-GPIO31)
1 Disable the internal pullup on the specified pin. (default for GPIO0-GPIO11)
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