R

EMDB6812

Copyright © 2004, EM Microelectronic-Marin SA

10

www.emmicroelectronic.com

3.4 PORT B LEDS

DS1…DS8 leds can be connected to EM6812 Port B

(Port B bit 0 … 7). Select ON for the

corresponding DIP2-10 position (1…8).

Buzzer (BUZ1 or BUZ2) can be connected to Port B bit 0. Select ON for the DIP2-10 position 9.

3.5 OSCILLATOR

By default, a 32768Hz crystal is assembled on each SampleBoard. Optionally crystal capacitance

can be added (2 empty footprints).

For specific EM6812 modes, it can be necessary to use OSCIN/OSCOUT for other purpose. If

necessary connect external signals on CON2-4 (OSCIN_EXT) or CON2-5 (OSCOUT_EXT) and

place jumpers on CON8-1/CON8-2 or CON8-3/CON8-4.

3.6 PROGRAMMING

During In-System-Programming it is recommended to isolate pins PB5 (SCLK) and PB7 (SDIO)

from the application connections. Refer to ISP programming application note for details.

A slide switch S8 selects the mode (programming or application) for both pins. For the current mode

to be executed, you must ensure the appropriate switch position selection.

3.7 RESET

A reset switch S7 reset the EM6812. It is also possible to add an external reset. This external reset

(RST_EXT) must be applied on CON2-3 and must be enabled by adding a jumper on CON7-

7/CON7-8.