Christian,

This is what I came up with, its a little confusing but, it worked. I had a much more condensed version but, I was not able to line up the clock pulses on one given condition, so I gave up and took the easy route out. The chip I am using takes a serial i/p where the first bit is an enable bit, followed by 32 bits of data w/ clock pulses. This is then followed by three more pulses to enable the chip, how confusing. Do you have any suggestions on how I could simplify this code?(a lot of NOP's to waste time)? Or do you think that it is satisfactory??? Thanks for the tip on writing to the outport from carry bit and thanks for all the help.

Ben

INIT_LSI:
clr p3.1
clr p3.0
setb p3.0 ;leading bit to enable LCD driver
setb p3.1 ;oscillator timing matters from this point -clk = 1
mov r6, #023h ;strobe in data =12 clks
mov r6, #023h ;to waste time =12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
clr p3.1 ;--------clock low
nop ;=12 clks
nop ;=12 clks
BYTE_FROM_CODE:
mov R7, #08h ;=12 clks (8 bits)
mov a, #00h ;=12 clks
movc a,@a+dptr ;=24 clks
BIT_XMIT:
nop ;=12 clks
rlc a ;=12 clks
mov p3.0, c ;=24 clks
setb p3.1 ;--------clock high
djnz r6, NOT_DONE ;=24 clks
call DONE_LSI_XMIT ;=24 clks
NOT_DONE:
djnz r7, HOLD_ON ;=24 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
inc dptr ;=24 clks
clr p3.1
call BYTE_FROM_CODE ;=24 clks
HOLD_ON:
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
clr p3.1
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
call BIT_XMIT ;=24 clks
DONE_LSI_XMIT:
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
nop ;=12 clks
clr p3.0