UM0156 datasheet(21/35 Pages) STMICROELECTRONICS

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UM0156 - USER MANUAL

4 DIP Switch Configuration

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4.3

EA Switch

This switch enables the Single Chip Mode (see

Figure 3 on page 7). By default it is in the ON

state. It can be set to the OFF state only if an external Flash memory is connected to the SDK-

ST10F269 board.

4.4

User Switch

It is located at the top of the development board (above the ST10F269, see

Figure 3) so the

developer can use the DIP switches to perform I/O operations by linking the JP2 connector to

the ST10F269.

4.5

I2C Switch

This switch is located to the right of the ST10F269, by the edge of the board (see

Figure 3).

4.5.1

1, 2 - Enable I2C

These switches connect the ST10F269 to the I2C bus.

4.5.2

3, 4 - External Devices Connection

These switches allow the user to connect external devices to the I2C bus.

4.5.3

5 - External Device Interrupt

When an external device is connected to the SDK-ST10F269, this switch allows the ST10F269

to receive external interrupts from the device.

4.5.4

6, 7 - EEPROM Connection

These switches allow the on-board EEPROM to connect to the I2C bus.

4.6

I2C 3.3V and 5V 3-pin Connectors

These connectors allow the user to interface the SDK-ST10F269 with external I2C 3.3V and 5V

peripherals.

Note: The ST10F269 only has HSSC peripheral connections. This is to facilitate I2C or SPI

protocol emulations. When HSSC connections are used with external units, the MTSR and

MRST pins must be connected together to form an I/O bus. This way, the HSSC peripheral can

be used to emulate the I2C protocol (after it is enabled using the switches).

UM0156 Datasheet(PDF) 21 Page - STMicroelectronics