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STMPE1801 数据表(PDF) 33 Page - STMicroelectronics

部件名 STMPE1801
功能描述  Xpander Logic™ 18-bit enhanced port expander with keypad controller
PDF  60 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STMPE1801 数据表(HTML) 33 Page - STMicroelectronics

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STMPE1801
GPIO controller
Doc ID 17884 Rev 3
33/60
10.1
GPIO control registers
A group of registers is used to control the exact function of each of the 18 GPIOs.
All the GPIO registers are named as GPIO_xxx_yyy, where:
–
xxx represents the functional group
–
yyy represents the byte position of the GPIO (LOW/MID/HIGH)
–
LOW registers control GPIO[7:0]
–
MID registers control GPIO[8:15]
–
HIGH registers control GPIO[17:16]
10.1.1
Bit description
The function of each bit is shown in the following table:
76
5
4
3
2
1
0
GPIO_xxx_HIGH
RESERVED
IO-16
IO-17
GPIO_xxx_MID
IO-15
IO-14
IO-13
IO-12
IO-11
IO-10
IO-9
IO-8
GPIO_xxx_LOW
IO-7
IO-6
IO-5
IO-4
IO-3
IO-2
IO-1
IO-0
Register name
Description
Function
GPIO_MP_yyy
GPIO monitor pin state
Reading this bit yields the current state of the bit. Writing
has no effect.
GPIO_SET_yyy
GPIO set pin state
Writing ‘1’ to this bit causes the corresponding GPIO to go
to ‘1’ state. Writing ‘0’ has no effect.
GPIO_CLR_yyy
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_DIR_yyy
GPIO set pin direction
‘0’ sets the corresponding GPIO to input state, and ‘1’ sets
it to output state.
GPIO_RE_yyy
GPIO rising edge
Set to ‘1’ enable rising edge detection on the
corresponding GPIO.
GPIO_FE_yyy
GPIO falling edge
Set to ‘1’ enable falling edge detection on the
corresponding GPIO.
GPIO_PULL_UP_yyy
GPIO pull up
Set to ‘1’ enable internal pull-up resistor.



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