PICBASIC shiftout command with MM5480N display driver

Hi there,

I've just hooked up a national semiconductor 3.5 digit display driver to my breadboard and plugged in the power and ground with several LEDs to see if I can get the first 11 pins or so to alternate on,off,on,off.

The MM5480N protocol is similar to the MM5481, 35 bits with a 1 at the beginning. I thought the datasheet said it latches when it encounters the 36th 1. In any case, my data out is pin 2 and my clock out is pin

2. DO SHIFTOUT 2, 3, MSBFIRST, [%1101010101010000\16, %0000000000000000\16, %0001\4] LOOP

first off, can my pic on this homework board that i have do this?

second, is my snippet of code right?

third, has anyone worked with these M548x display drivers before using SHIFTOUT? Using something else?

Any suggesti "Using a format of a leading ``1'' followed by the 35 data bits allows data transfer without an additional load signal. The 35 data bits are latched after the 36th bit is complete, thus providing non-multiplexed, direct drive to the display. Outputs change only if the serial data bits differ from the previous time. Display brightness is determined by control of the output current for LED displays. A 0.001 mF ceramic or mica disc capacitor should be connected to brightness control, pin 13, to prevent possible oscillations."

I wonder if that means the 36th bit is the 1st bit of the next set of

I do not have a cap hooked up to the brightness control.

I have a wire coming off Vdd that measures around 4V with current at .68mA

I'm at work and dont have the board in front of me... cry

more info from the datasheet (found at

Thanks,

-nick