Assembly Instructions

For minimum operation you have to install IC1, XTAL, C1, C2, C3, C11, C12 & R3. A resonator can be used instead of the XTAL - C2 and C3 can then be omitted. When using the RC Reset (C12 / R3), you also need to install jumper J6 (Rev.B board only) or jumper pin 1 & 6 of IC3 (Rev.A board only) , so the reset signal reaches the microcontroller. You can also add the PB1 pushbutton for a manual RESET if you do not have that on any other place (like e.g. on the DT003/DT006).

If you need a bit better RESET (due to other hardware in the system like EEPROM etc. and you want to guarantee that the microcontroller doesn't write to the EEPROM when voltage is too low, then you should install the Brownout device Q1 and the resistor R6 (Rev.B board only).

If you need the best RESET performance with a delayed RESET of 200-300mS, don't install C12 / R3 or Q1 / R6, instead just install the IC3 (MAX701).

STK200 Compatible Programming

Then if you need ISP (In System Programmable) with a Kanda / Atmel STK200 compatible programmer, you need to install J2 and if you like to have indication when programming etc. also R2 and LD1.

On-chip ADC

If you want to use the ADC of the AT90S8535, then install R1 and C4 and optionally the J2 IDC connector. By default Jumper J1  applies 5VDC to the AREF of the ADC and if you need any other reference voltage, cut that wire open on the board and install J1, so you can select a different reference voltage. Pin 9 on the J1 connector could then be used for applying the new voltage reference. There is also a very small Prototype/Experiment area and one of the pads are connected to 0VDC (GND) and the other 5VDC (VCC).

On-board RS232

To add on-board RS-232, you need to install IC2, C5, C6, C7, C8, C9 and the J4 IDC connector. The J4 IDC connector is pin compatible with the SLI-OEM from Wirz, so adding a straight ribbon cable between the SIMM100 and the SLI-OEM makes it simple and easy to use a serial LCD.

External (non-5V) Power Supplies

If you do not have access to 5VDC and would like to use e.g. 9-12VDC then install the voltage regulator V1 and capacitor C10.

On-board LEDs

Finally the two user definable / general purpose LEDs (LD2 & LD3) and their resistors (R4 & R5) could be mounted and controlled via PC0 & PC1 of the microcontroller, note that they sink current into the microcontroller, so turning them on need a LOW output (0VDC) and turning them off needs a HIGH output (5VDC).

Accessing PD Port Bits 4-7

J5 is also a small 4 pin connector for the rest of the PD port (PD4-7) that isn't routed out the the SimmStick bus.