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STR720 Datasheet(PDF) 345 Page - STMicroelectronics

No. de pieza STR720
Descripción Electrónicos  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
PDF  401 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR720 Datasheet(HTML) 345 Page - STMicroelectronics

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STR720 - GENERAL PURPOSE I/O PORTS
345/401
23.3.1
Input Configuration
When the IO Port is programmed as Input:
■
The Output Buffer is forced tristate
■
The data present on the IO pin is sampled into the Input Latch every clock cycle
■
A reading access to the Data register gets the value in the Input Latch.
The Figure 63 on page 345 shows the Input Configuration of the IO Port bit.
23.3.2
Bidirectional Configuration
When the IO Port is programmed as Bidirectional:
■
The Output Buffer is turned on in Weak Pull configuration (Port2)
■
The Output Buffer is turned on in Weak Push configuration (Port3, Port4)
■
A reading access to the IO Data register gets the Input Latch value.
Figure 63. Input Configuration
I/O PIN
Alternate Function (OUT)
Alternate Function (IN)
Tristate
CMOS



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