Post by thread:RAM

On Thu, 5 Oct 1995, FICK, N, N, FCKNOR001 wrote: > I am busy with a project that requires about 350 bytes of RAM. I'm > using the PIC16C74 with only 192 bytes. Is there any way of > increasing the amount of RAM for the PIC's. > > > Thanks in advance > > Norman > You can have byte wide RAM sitting off of the eight bit port. Use the smaller port to latch the address, read/write to RAM, and accept data from the port. This should give you more than enough RAM. Stuart Allman spam_OUTstudioTakeThisOuThalcyon.com

How could I interface a PIC to a 30 pin RAM module? Thanx, Andrew ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: dl.http://www.juno.com/get/tagj.

On Wed, Jan 05, 2000 at 02:12:12PM -0500, Andrew T Kelley wrote: > How could I interface a PIC to a 30 pin RAM module? Connect the I/O pins of the PIC to the RAM module. Usually this means you will need one I/O pin for each address and data line, and one for each control line, such as RAS and CAS if it is dynamic RAM. Further, your program needs to operate the internal refresh process of the RAM chips as well, again if they are dynamic. The data sheets of the chips should explain how to do this. You may find this to be a lot of I/O pins. Get a bigger PIC. -- James Cameron .....quozlKILLspam@spam@us.netrek.org http://quozl.us.netrek.org/

>How could I interface a PIC to a 30 pin RAM module? > >Thanx, >Andrew >________________________________________________________________ For 30pin SIMM/SIP Pin connections (Use Courier font for best results) ... ...Pin Name Pin No. 256Kx 8(9) 1Mx8(9) 4Mx8(9) 16Mx8(9) 1. Vcc. <------. <-----. <----- 2 /CAS. <------. <-----. <-----. 3. DQ0. <-----. <-----. <-----. 4. A0. <----- <-----. <----- 5. A1 <------ <------. <------ 6 DQ1 <------. <-----. <----- 7 A2 <------. <-----. <------ 8 A3 <------. <-----. <----- 9 Vss <-----. <----- <----- 10 DQ2 <-----. <-----. <----- 11 A4 <-----. <-----. <----- 12 A5 <-----. <-----. <----- 13 DQ3 <-----. <-----. <----- 14 A6 <-----. <-----. <----- 15 A7 <-----. <-----. <----- 16 DQ4 <-----. <-----. <----- 17 A8 <-----. <-----. <----- 18 NC. A9. <-----. <----- 19 NC. <-----. A10. <----- 20 DQ5. <-----. <----. <----- 21 /W. <-----. <----. <----- 22 Vss. <-----. <----. <-----. 23 DQ6. <-----. <-----. <----- 24 NC. <-----. <-----. A11 25 DQ7. <-----. <-----. <----. 26 NC (Q8) <-----. <-----. <----- 27 /RAS <-----. <----. <------ 28 NC (/CAS8) <-----. <-----. <-----. 29 NC (D8) <----. <-----. <----- 30 Vcc <-----. <-----. <----- You can use 74ls573 (for address and control pins) and 74ls245 (for data pins), or similar devices. If you want i can send you 72pin SIMM/SIP Pin connections too. Regards Javier Martinez.

On Thu, 6 Jan 2000 11:44:36 +0100 =?iso-8859-1?Q?Javier_Mart=EDnez?= <JAPUS11KILLspamTELELINE.ES> writes: > >How could I interface a PIC to a 30 pin RAM module? > > > >Thanx, > >Andrew > >________________________________________________________________ > > > For 30pin SIMM/SIP Pin connections (Use Courier font for best > results) > <SNIP> > > If you want i can send you 72pin SIMM/SIP Pin connections too. > > Regards Javier Martinez. Sure, I'll take the 72 pin connections... Andrew ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: dl.http://www.juno.com/get/tagj.

see: 204.210.50.240/techref/default.asp?url=microchip\picsimm.htm 16C74A to SIMM interface pin out and code. more at http://204.210.50.240/techref/default.asp?url=microchip\routines.htm James Newton .....jamesnewtonKILLspam.....geocities.com phone:1-619-652-0593 http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS! Members can add private/public comments/pages ($0 TANSTAAFL web hosting) {Original Message removed}