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10.1
GPIO control registers
A group of registers is used to control the exact function of each of the 16 GPIOs.
All the GPIO registers are named as GPxxx_yyy, where:
–
Xxx represents the functional group
–
Yyy represents the byte position of the GPIO
–
Lsb registers control GPIO[7:0]
–
Msb registers control GPIO[8:15]
The function of each bit is shown in the following table:
Table 20.
Bit description
765
43
21
0
GPxxx_msb
IO-15
IO-14
IO-13
IO-12
IO-11
IO-10
IO-9
IO-8
GPxxx_lsb
IO-7
IO-6
IO-5
IO-4
IO-3
IO-2
IO-1
IO-0
Table 21.
Register description
Register name
Function
GPIO monitor pin state
Reading this bit yields the current state of the bit. Writing has no effect.
GPIO set pin state
Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘1’ state.
Writing ‘0’ has no effect.
GPIO clear pin state
Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘0’ state.
Writing ‘0’ has no effect.
GPIO set pin direction
‘0’ sets the corresponding GPIO to input state, and ‘1’ sets it to output
state
GPIO edge detect status
Set to ‘1’ by hardware when there is a rising/falling edge on the
corresponding GPIO. Writing ‘1’ clears the bit. Writing ‘0’ has no effect.
GPIO rising edge
Set to ‘1’ to enable rising edge detection on the corresponding GPIO.
GPIO falling edge
Set to ‘1’ to enable falling edge detection on the corresponding GPIO.
GPIO pull up
Set to ‘1’ to enable internal pull-up resistor



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