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STR720 Datasheet(PDF) 347 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) 347 Page - STMicroelectronics

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STR720 - GENERAL PURPOSE I/O PORTS
347/401
23.3.3
Output Configuration
When the IO Port is programmed as Output:
■
The Output Buffer is turned on in Open Drain or Push-Pull configuration
■
The data in the Output Latch drives the IO pin
■
A reading access to the IO Data register gets the Output Latch value.
The Figure 66 on page 347 shows the Output Configuration of the IO Port bit.
23.3.4
Alternate Function Configuration
When the IO Port is programmed as Alternate Function:
■
The Output Buffer is turned on in Open Drain or Push-Pull configuration
■
The Output Buffer is driven by the signal coming from the peripheral (alternate function out)
■
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.
Figure 66. Output Configuration
I/O PIN
Alternate Function (OUT)
Alternate Function (IN)
Open Drain
Push-Pull



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