STR71XF datasheet(8/78 Pages) STMICROELECTRONICS

8 / 78 page

System architecture

STR71xF

8/78

Realtime clock (RTC)

The RTC provides a set of continuously running counters driven by the 32 kHz external

crystal. The RTC can be used as a general timebase or clock/calendar/alarm function.

When the STR71x is in Standby mode the RTC can be kept running, powered by the low

power voltage regulator and driven by the 32 kHz external crystal.

UARTs

The 4 UARTs allow full duplex, asynchronous, communications with external devices with

independently programmable TX and RX baud rates up to 1.25 Mb/s.

Smartcard interface

UART1 is configurable to function either as a general purpose UART or as an asynchronous

Smartcard interface as defined by ISO 7816-3. It includes Smartcard clock generation and

provides support features for synchronous cards.

Buffered serial peripheral interfaces (BSPI)

Each of the two SPIs allow full duplex, synchronous communications with external devices,

master or slave communication at up to 5.5 Mb/s in Master mode and 4 Mb/s in Slave mode.

I2C interfaces

The two I2C Interfaces provide multi-master and slave functions, support normal and fast

I2C mode (400 kHz) and 7 or 10-bit addressing modes.

One I2C Interface is multiplexed with one SPI, so either 2xSPI+1x I2C or 1xSPI+2x I2C may

be used at a time.

HDLC interface

The High Level Data Link Controller (HDLC) unit supports full duplex operation and NRZ,

NRZI, FM0 or MANCHESTER protocols. It has an internal 8-bit baud rate generator.

A/D converter

The Analog to Digital Converter, converts in single channel or up to 4 channels in single-

shot or round robin mode. Resolution is 12-bit with a sampling frequency of up to 1 kHz. The

input voltage range is 0-2.5V.

Watchdog

The 16-bit Watchdog Timer protects the application against hardware or software failures

and ensures recovery by generating a reset.

I/O ports

The 48 I/O ports are programmable as Inputs or Outputs.

External interrupts

Up to 14 external interrupts are available for application use or to wake up the application

from STOP mode.

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