ST7263 datasheet(7/109 Pages) STMICROELECTRONICS

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ST7263

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PIN DESCRIPTION (Cont’d)

RESET (see Note 1): Bidirectional. This active low

signal forces the initialization of the MCU. This

event is the top priority non maskable interrupt.

This pin is switched low when the Watchdog has

triggered or VDD is low. It can be used to reset ex-

ternal peripherals.

OSCIN/OSCOUT:

Input/Output Oscillator

pin.

These pins connect a parallel-resonant crystal, or

an external source to the on-chip oscillator.

VPP/TEST: EPROM programming input. This pin

must be held low during normal operating modes.

VDD/VSS (see Note 2): Main power supply and

Ground voltages.

VDDA/VSSA (see Note 2): Power Supply and

Ground for analog peripherals.

Alternate Functions: Several pins of the I/O ports

assume software programmable alternate func-

tions as shown in the pin description.

Note 1: Adding two 100nF decoupling capacitors

on Reset pin (respectively connected to VDD and

VSS) will significantly improve product electromag-

netic susceptibility performances.

Note 2: To enhance reliability of operation, it is

recommended to connect VDDA and VDD together

on the application board. The same recommenda-

tions apply to VSSA and VSS.

Table 2. Device Pin Description

Pin n°

Pin Name

Level

Port / Control

Main

Function

(after reset)

Alternate Function

Input

Output

VDD

Power supply voltage (4V - 5.5V)

OSCOUT

Oscillator output

OSCIN

Oscillator input

VSS

Digital ground

PC2/USBOE

I/O

Port C2

USB Output Enable

PC1/TDO

I/O

Port C1

SCI transmit data output *)

PC0/RDI

I/O

Port C0

SCI Receive Data Input

RESET

I/O

Reset

Not connected

10 PB7/AIN7/IT8

I/O CT 10mA X

Port B7

ADC analog input 7

10 11 PB6/AIN6/IT7

I/O CT 10mA X

Port B6

ADC analog input 6

11 12 VPP/TEST

Supply for EPROM and test input

12 13 PB5/AIN5/IT6

I/O CT 10mA X

Port B5

ADC analog input 5

13 14 PB4/AIN4/IT5

I/O CT 10mA X

Port B4

ADC analog input 4

14 15 PB3/AIN3

I/O CT 10mA X

Port B3

ADC analog input 3

15 16 PB2/AIN2

I/O CT 10mA X

Port B2

ADC analog input 2

16 17 PB1/AIN1

I/O CT 10mA X

Port B1

ADC analog input 1

17 18 PB0/AIN0

I/O CT 10mA X

Port B0

ADC Analog Input 0

18 19 PA7/OCMP2/IT4

I/O

Port A7

Timer Output Compare 2

19 20 PA6/OCMP1/IT3

I/O

Port A6

Timer Output Compare 1

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