Coldfire V1 & V2

Eric_t — Mon, 06 Aug 2012 01:43:48 GMT

Hi everybody,

I am going to start two projects; one with Coldfire V1 (MCF51MM128CLK) and one with Coldfire V2(MCF52252AF80)

I have attached two schematics.

Could someone tell me if there is any error between the controller and debugger connector?

Also I am not sure where the ALLPST pin of coldfire V2 should be connected.

Thanks

Nikos

Re: Coldfire V1 & V2

TomE — Tue, 07 Aug 2012 21:25:46 GMT

Download every development board schematic you can find and see how things are connected. there. Copy them slavishly.

1.5.2 Integrated Debug Module

The device includes a new debug signal, ALLPST. This signal is the logical AND

of the processor status (PST[3:0]) signals and is useful for detecting when the

processor is in a halted state (PST[3:0] = 1111).

Does your debugger need DDATA[3:0] and PST[3:0]? Does it need ALLPST as well or instead?

Note "33.4.6 Freescale-Recommended BDM Pinout" shows 23 of the 26 pins connected. You have 13. That my be what you want, but check. Your debugger manual might clear this up.

I don't like your power-on circuitry. THe chip has "low voltage detect" forcing reset, but it doesn't trigger until 2.15V, and the CPU isn't rated to run at under 3.0V. I think you need an external reset generator on RSTI, so it mightn't survive or recover from a brownout.

Why are you adding pulldowns on all those pins? You don't need to pull any pin you can program as an output and force high or low.

Tom

ColdFire/68K Microcontrollers and ProcessorsのトピックColdfire V1 & V2

Coldfire V1 & V2

Re: Coldfire V1 & V2