Post by thread:[pic] Moving up from 16F648A

I need more I/O for my next project than the 16F648 has. I need about 14 output and 3 input, two of which are interrupts. Ideally, a few more inputs are useful too, but not required. Any suggestions? --Michael

The 16F690 has 18 GPIO, 12 ADC, ECCP, USART, I2C, SIP. ----- Original Message ----- From: "M Graff" <spam_OUTexplorer-piclistTakeThisOuTflame.org> To: <.....PiclistKILLspam@spam@mit.edu> Sent: Wednesday, November 23, 2005 1:05 AM Subject: [pic] Moving up from 16F648A >I need more I/O for my next project than the 16F648 has. I need about > 14 output and 3 input, two of which are interrupts. Ideally, a few more > inputs are useful too, but not required. > > Any suggestions? > > --Michael > --

> I need more I/O for my next project than the 16F648 has. I > need about > 14 output and 3 input, two of which are interrupts. Ideally, > a few more > inputs are useful too, but not required. > > Any suggestions? 74HC595? 16F876A? 18F252? uChip has some nice SPI and I2C expanders too. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: http://www.voti.nl/hvu

On 11/23/05, M Graff <explorer-piclistKILLspamflame.org> wrote: > I need more I/O for my next project than the 16F648 has. I need about > 14 output and 3 input, two of which are interrupts. Ideally, a few more > inputs are useful too, but not required. > > Any suggestions? Usually, all tricks for sharing pin functions will help. Example: 4 buttons may be connected between the ENABLE pin and the other 4 data pins of a LCD module if four diodes are mounted in series with the buttons. Disabling the LCD will allow button read, enabling the LCD will deactivate buttons. There are many other tricks, the only way to do those tricks is to analyze carefully your application before claiming a jump to a bigger PIC. cheers, Vasile http://surducan.netfirms.com

> I need more I/O for my next project than the 16F648 has. I > need about 14 output and 3 input, two of which are interrupts. > Ideally, a few more inputs are useful too, but not required Like Vasile was saying, what I/O functions do you need ? There are ways to get around I/O shortages by multiplexing with s/w or h/w Moving to a bigger PIC is the obvious easy way, but making a smaller PIC accomplish the same thing is more rewarding

M Graff wrote: > I need more I/O for my next project than the 16F648 has. I need about > 14 output and 3 input, two of which are interrupts. Ideally, a few more > inputs are useful too, but not required. > > Any suggestions? Since you say only the number of pins matter, then 16F876A, 18F2520, or 13F3013. A better answer will require a better question. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products