P&E Multilink and Reset Line | 68HC12

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

Hi Folks, Does anyone happen to know what the P&E BDM Multilink pod uses to drive the reset line? My pod is labelled 1.8V-5.5V Rev B BDM MULTILINK HC12 - 68MC9S12. The issue is that we're using an MC9S12H256 processor (well, actually PC9S12H256 for now) with a Motorola MC33989 System Basis Chip for regulators, watchdog, reset, CAN transceiver, etc. The problem is that the Reset output from the MC33989 engages in a horrible struggle with the BDM pod (I assume) for control of the processor during programming. Right now, the processor is losing. As a workaround, I've just removed the resistor between the 33989 and the rest of the reset line which works fine, but we're going to field trials and I'd like to have the 33989 reset connected. I can tie the 33989 reset pin to 5 volts during programming (ok per the 33989 data sheet) but I need to size the resistor between the 33989 and the processor so that the BDM pod can still wiggle the line with the (effectively) pull-up resistor in place. Anyone have any good ideas? Much thanks, Pat

(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )

Sign in

Search 68hc12

Subscribe to 68hc12

68hc12 by Keywords

Ads

Discussion Groups

See Also

Discussion Groups | 68HC12 | P&E Multilink and Reset Line

P&E Multilink and Reset Line - Pat Fitzpatrick - Oct 3 11:18:00 2002