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STMPE821 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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STMPE821 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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The function of each bit is shown in the following table:
Table 9.
GPIO control bits function
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' to this bit causes the corresponding GPIO to go to '0' state
GPIO set pin direction
'0' sets the corresponding GPIO to input state, and '1' sets it to output
state. All bits are '0' on reset. The GPIO must be set as output if the
PWM on this pin is to be used.
GPIO function
'1' sets the corresponding GPIO to function as GPIO/PWM, and '0'
sets it to touch key mode.
For GPIO 0-3, if the GPIO function is set to GPIO/PWM mode and the
AF bits in the PWM master enable register is enabled, the
corresponding GPIO will function as PWM output.



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