I neglected to mention a couple of other details that might prove useful to you. The Winstar and Vishay documentation is not very clear about this display's use in modes other than 4-bit and 8-bit parallel, but it does interface via SPI (but not I2C as I mentioned earlier). The pin connections required in this mode are Gnd/Pin1, Vcc/Pin2, Clk/Pin12, MISO/Pin13, MOSI/Pin14, CS/Pin15. The CS pin is active low. The data sheets indicate pin 16 has no function, but it is an active low reset tied directly to the 0012 controller IC (there's an internal pull-up resistor). You might try connecting this to your uC and incorporating a reset into your code in places where you need to reinitialize the display. This reset is wired such it will work in any interface mode.