UM0224 datasheet(5/34 Pages) STMICROELECTRONICS

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STR75x demonstration software

Functional description

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1.1

Power Control

The evaluation board is powered by an external 5V supply all other required voltage are

provided by on-board voltage regulators.

1.2

Clocking

Three clock sources are available on STR75x-EVAL evaluation board for STR750Fx, USB

and RTC:

●

32 kHz Crystal for embedded RTC.

●

4 MHz Crystal for STR750Fx.

●

48 MHz Oscillator for USB.

1.3

Reset control

The Reset can be generated by hardware or software sources:

●

Reset button: activates the RESET input when pressed.

●

A JTAG reset

1.4

Debug JTAG interface

Software debug is done via the standard ARM JTAG connection: 20 pins IDC to connect to

the standard ARM host interface.

1.5

Displays and input devices

1.5.1

LCD

122x32 graphic LCD display connected to GPIOs.

1.5.2

LED

4 general purpose LED’s are available as display device.

1.5.3

Joystick

4-direction joystick with selection key.

1.6

Interfaces

1.6.1

RS232

The STR75x evaluation board (STR75x-EVAL) provides three on-board RS-232 serial ports.

Two channels, UART1 and UART2, use one RS-232 transceiver U12.

For the UART0 with handshake signal support, it uses another RS-232 transceiver.

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