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STMPE2401 数据表(PDF) 29 Page - STMicroelectronics

部件名 STMPE2401
功能描述  24-bit Enhanced port expander with Keypad and PWM controller Xpander logic
PDF  55 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STMPE2401 数据表(HTML) 29 Page - STMicroelectronics

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10.1
GPIO control registers
A group of registers are used to control the exact function of each of the 24 GPIO. All GPIO
registers are named as GPxxx_yyy, where
Xxx represents the functional group
Yyy represents the byte position of the GPIO
Lsb registers controls GPIO[7:0]
Csb registers controls GPIO[15:8]
Msb registers controls GPIO[23:16]
Note:
This convention does not apply to the GPIO Alternate Function Registers
The function of each bit is shown in the following table:
Address
Register name
Description
Auto-Increment
(during sequential R/W)
0x9B
GPAFR_U_msb
GPIO Alternate Function Register
(Upper Bit)
Yes
0x9C
GPAFR_U_csb
Yes
0x9D
GPAFR_U_lsb
Yes
0x9E
GPAFR_L_msb
GPIO Alternate Function Register
(Lower Bit)
Yes
0x9F
GPAFR_L_csb
Yes
0xA0
GPAFR_L_lsb
Yes
0xA5 – 0xAF
RESERVED
Reserved
Yes
Table 26. GPIO controller
Table 27. Register
Bit
7
65
43
210
GPxxx_msb
IO-23
IO-22
IO-21
IO-20
IO-19
IO-18
IO-17
IO-16
GPxxx_csb
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 28. Bit’s 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’ 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



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