topic Re: MC13213 SRD and NCB Hardware Design Error?? in 8-bit Microcontrollers

MC13213 SRD and NCB Hardware Design Error??

fgs_chuck — Thu, 10 May 2007 05:07:55 GMT

The schematics for the SRD and NCB boards show some signals from Port C connected to IC 104 which is an Atmel AT25HP512. I believe that this is a 65K x 8 bit EEPROM with a serial SPI interface. Unfortunately, Port C isn't the SPI. Unless I'm missing something, I don't see how this chip can ever be driven by the MC13213. Also, you can't simply re-wire the EEPROM to the SPI signals on the MC13213 because they are reserved for use by the wireless transceiver internal to the SOC.

Does anyone else have any ideas?

Chuck Matthews

Re: MC13213 SRD and NCB Hardware Design Error??

peg — Thu, 10 May 2007 06:47:44 GMT

Hi,

Bit-banged SPI?

It's pretty simple to do.

Re: MC13213 SRD and NCB Hardware Design Error??

fgs_chuck — Thu, 10 May 2007 19:52:27 GMT

Hmm, didn't think of that. Has anyone seen any occurrence of this in any of the examples from Freescale? Perhaps in a template that the ZigBee BeeKit produces?

Regards,
Chuck

Re: MC13213 SRD and NCB Hardware Design Error??

FPatrick — Thu, 11 Oct 2007 22:21:27 GMT

Hello Chuck,

I think the SPI is only for the internal connection between the MCU and the modem.

There is no SPI connection outside. You have to implement the sw SPI routines.

We design our own devices using external FLASH via SPI, and I had to code this feature.

Regards,

Peter