• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

sharing CE of ram with radio module clock input.

Not open for further replies.


I am using a DIP IC 628128P as my ram with pin 30 (CE2) to VCC and pin 22 (CE1) to a GPIO pin of a microcontroller. Based on my circuit board design, the only GPIO pin I can use for the SPI interface (to a 3rd party radio module) is the same as that used to enable/disable the ram.

The microcontroller is AT89S52 and I'll be driving it with a 22.1184Mhz crystal so I can interface it with a PC. Even though the radio modules (which I found at http://futurlec.com/Radio.shtml) are expected to deliver 115kbps data, my application only needs no more than 9600kbps

If I were to buy a radio module from http://futurlec.com/Radio.shtml, which would be legal to import and use in Canada?

Also, other than enabling/disabling the ram, is there any side effects to the ram if I constantly toggle the CE pin at a high rate (of say 1Mhz speed)? I never attempt to make access to ram while the clock to the radio module is running.
Not open for further replies.

Latest threads

EE World Online Articles