STR720 datasheet(347/401 Pages) STMICROELECTRONICS

部件名	STR720

功能描述	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

347 / 401 page

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

STR720 数据表(PDF) 347 Page - STMicroelectronics