ST52F510 datasheet(16/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

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1.3 Pin Description

ST52F510/F513/F514 pins can be set in digital

input mode, digital output mode, interrupt mode or

Alternate

Functions.

configuration

achieved by means of the configuration registers.

The functions of the ST52F510/F513/F514 pins

are described below:

VDD. Main Power Supply Voltage.

VDDIO. I/O Ports Power Supply Voltage. It is

reccomended to connect this pin with a supply

voltage de-coupled with VDD in order to improve

the immunity from the noise generated by the I/O

switching.

VSS. Digital circuit Ground.

VSSIO. I/O Ports Ground. See VDDIO

VPP. Programming/Working mode selector. During

the Programming phase VPP must be set to VDD.

In Working phase VPP must be equal to VSS.

OSCin and OSCout. These pins are internally

connected to the on-chip oscillator circuit. A quartz

crystal or a ceramic resonator can be connected

between these two pins in order to allow correct

use of ST52F510/F513/F514 with various stability/

cost trade-offs. An external clock signal can be

applied to OSCin: in this case OSCout must be

grounded. To reduce costs, an RC circuit can be

applied to the OSCin pin to establish the internal

clock frequency, instead of the quartz. Without any

connection, the device can work with its internal

clock generator (10 MHz)

RESET. This signal is used to reset the ST52F510/

F513/F514 and re-initialize the registers and

control signals. It is also used when switching from

the Programming Mode to Working Mode and vice

versa.

PA0-PA7, PB0-PB7,PC0-PC5. These lines are

organized as I/O ports. Each pin can be configured

as an input, output (with pull-up, push-pull, weak-

pull-up, open-drain, high-impedance), or as an

interrupt source.

VREF, AIN0-AIN7. These pins are used to input

the analog signals into the A/D Converter. An

analog multiplexer is available to switch these

inputs to the A/D Converter. The pin VREF is used

to input an external A/D Reference Voltage.

T0OUT, T1OUT. These pins output the signals

generated by the PWM/Timer 0 and PWM/Timer 1

peripheral.

TRES, TSTRT, TCLK . These pins are related to

the PWM/Timer 0 peripheral and are used for Input

Capture and event counting. The TRES pin is used

to set/reset the Timer; the TSTRT pin is used to

start/stop the counter. The Timer can be driven by

the internal clock or by an external signal

connected to the TCLK pin.

INT. This pin is used as input for the Non-Maskable

(top level) interrupt. The interrupt signal is detected

only if the pin is configured in Alternate Function.

SCL, SDA. These pin are used respectively as

Serial Clock and Serial Data I/O in I2C peripheral

protocol. They are used also in Programming

Mode to receive and transmit data.

TX, RX. Serial data output of SCI Transmitter block

(TX) and Serial data input of the SCI Receiver

block (RX).

SCK, MISO, MOSI, SS. These pins are used by

the Serial Peripheral Interface (SPI) peripheral.

SCK is the serial clock line. MISO (Master In Slave

Out) and MOSI (Master Out Slave In) are the serial

data lines, which work in input or in output

depending on if the device is working in slave or

master mode. The SS pin allows the selection of

the device master/slave mode.

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