ST7263BK4 Ver la hoja de datos (PDF) - STMicroelectronics

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ST7263BK4

Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C

STMicroelectronics 

ST7263Bxx

2

Pin description

Pin description

2.1

Note:

2.2

RESET signal (bidirectional)

It is active low and forces the initialization of the MCU. This event is the top priority non

maskable interrupt. This pin is switched low when the Watchdog is triggered or the VDD is

low. It can be used to reset external peripherals.

Adding two 100 nF decoupling capacitors on the Reset pin (respectively connected to VDD

and VSS) will significantly improve product electromagnetic susceptibility performance.

OSCIN/OSCOUT: input/output oscillator pin

These pins connect a parallel-resonant crystal, or an external source, to the on-chip

oscillator.

2.3

Note:

VDD/VSS

Main power supply and ground voltages

To enhance the reliability of operation, it is recommended that VDDA and VDD be connected

together on the application board. This also applies to VSSA and VSS.

2.4

Note:

VDDA/VSSA

Power supply and ground voltages for analog peripherals.

To enhance the reliability of operation, it is recommended that VDDA and VDD be connected

together on the application board. This also applies to VSSA and VSS.

2.5

Alternate functions

Several pins of the I/O ports assume software programmable alternate functions as shown

in the pin description.

Note: 1 The USBOE alternate function is mapped on Port C2 in 32/34/48 pin devices. In SO24

devices it is mapped on Port B1.

2 The timer OCMP1 alternate function is mapped on Port A6 in 32/34/48 pin devices. In SO24

devices it is not available.

Doc ID 7516 Rev 8

13/186

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