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Atmel AVR Microcontroller discussion group.
[AVR club] Help requested !!! - jasw...@yahoo.com - Jul 30 13:03:38 2006
Hi everybody,
I intend to do a remote control with IR Transmitter and receiver using AT89C51 .I have have to inter face a 4X4 keyboard and an LCD display to it . Can someone help me out by suggestin links or sending me attachments with notes or coding (may be C language or in assembly language) regarding the interfacing of AT89C51 with a 4X4 keyboard matrix and an LCD Display!!!
Thanks to all those who have taken some time off to help me out !!!!
Regards to all!!!
Jaswanthi
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
I intend to do a remote control with IR Transmitter and receiver using AT89C51 .I have have to inter face a 4X4 keyboard and an LCD display to it . Can someone help me out by suggestin links or sending me attachments with notes or coding (may be C language or in assembly language) regarding the interfacing of AT89C51 with a 4X4 keyboard matrix and an LCD Display!!!
Thanks to all those who have taken some time off to help me out !!!!
Regards to all!!!
Jaswanthi
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
[AVR club] why STK500 have different clock - alex - Jul 31 8:29:54 2006
why is it that it seems stk500 has a slower clock than the actual xtal installed?
example, when using 4MHz for a circuit other than STK and using the UART to output 9600-8-n-1, then set UBRRL=0x019
however when using STK500 w/ same xtal on the slot provided for, transmitting the same data and w/ same specs, the settings should be UBRRL=0x17. using 0x19 will cause distortion
why is this ? any idea how to "correct" this on the STK500?
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example, when using 4MHz for a circuit other than STK and using the UART to output 9600-8-n-1, then set UBRRL=0x019
however when using STK500 w/ same xtal on the slot provided for, transmitting the same data and w/ same specs, the settings should be UBRRL=0x17. using 0x19 will cause distortion
why is this ? any idea how to "correct" this on the STK500?
---------------------------------
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Re: [AVR club] why STK500 have different clock - Zack Widup - Jul 31 8:55:00 2006
Well, for one thing, the default frequency of the oscillator on the STK500
is 3.68 MHz. Read tht manual.
Zack
On Mon, 31 Jul 2006, alex wrote:
> why is it that it seems stk500 has a slower clock than the actual xtal installed?
>
> example, when using 4MHz for a circuit other than STK and using the UART to output 9600-8-n-1, then set UBRRL=0x019
>
> however when using STK500 w/ same xtal on the slot provided for, transmitting the same data and w/ same specs, the settings should be UBRRL=0x17. using 0x19 will cause distortion
> why is this ? any idea how to "correct" this on the STK500?
>
>
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