Exactly by my meaning. Let me know if it works.

Igor

-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of WH Tan
Sent: Monday, February 17, 2003 5:12 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: [EE]: 1 I/O interface to LCD - ONE chip solution


Thanks a lot Igor.
Just to make sure I am not interpreting anything wrongly. Is this what you
means?
Thanks again.


WH Tan

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Igor Pokorny
> Sent: 16 February 2003 07:29
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: [EE]: 1 I/O interface to LCD - ONE chip solution
>
>
> Hello Tan.
> I suggest you a solution with one pin of a PIC. I haven't proved it if it
> works, but it's an idea at least.
> Use some sort of 4094, outputs to LCD d7..d4, d/i, r/w and E. E
> must be tied
> to Vss by a resistor.
> Connect an output pin of a PIC to D input, by C to clock with
> resistor tied
> to Vdd and by diode to STR.
> STR input has a capactor to Vss and resistor to Vdd. OE of 4094 is in high
> state all the time.
> Output of a PIC is at high level, so STR, CLK is high as well,
> the output is
> enable.
> When you drive output to low level for a certain time, STR and CLK signals
> go to low. the output of 4094 is NC.
> STR is going to Vdd and when reached high level with input still in low
> level, zero will be written to serial register.
> If input low level isn't long enough to allow CLK reachs high,
> the one will
> be written to serial register in the time when input gets from low to high
> level.
> When input stay enough long in high level, the STR input gets high and
> writes result to output buffer.
> Hope it helps you a little.
>
> Igor


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