Description: I am trying to establish communication with the new low pin count part, trying to get it operating in monitor mode so that I can program it. I am using the same hardware and software that I have been using for the 68HC908SR12 part which we have been using for years. I have not had any success. Conditions: I am providing a 9.8304MHz clock into osc1 pin 4, 5V to VDD pin 1, VEE pin 16 to gnd, PTA1 pin 12 to 5V thru 10K, PTA4 pin 5 to gnd thru 10K, PTA0 pin 13 is digital I/O, connected /IRQ pin 9 to the higher voltage required for monitor mode, RST pin 8 to 5V thru 10K and am using "PROG08SZ.exe" software. Please review and let me know if you see a problem. I have gone over my connections verifying against the data book several times and am about out of tricks. Thanks so much for any help.
There is one strange bug there. You must connect circa 10 nF between IRQ and ground. Whithout this cap I always observ some strange oscillations there. And of course remember that VDD must go below 0,1 V during POR. So make a switch which not only removes power but also connects VDD during POR to ground. It must work.
