danyat
Junior Member level 1
ds89c450
Hi!
Does anybody ever tried somthing with a DS89C4[3/4/5]0 Microcontroller? Ive 2 of them and tried to communicate with the ROM-Loader (which should be onchip) - but without success.
Ive set it up on a problem-board, with a xtal (12mhz) and pulled the rst high, the /EA and /PSEN low (as mentioned in the datasheet).
A max232 to the UART0 (RXD0, TXD0) and a PC with serial-terminal-prog on the other side. The datasheet says, that the Micro should autodetect the baud-rate (upon a <CR>) and than return a initial Banner (some ascii text) to the terminalprog... But nothing happens. The xtal is running (oszilloscope).
What may be wrong? Any idea?
Ive no paralell-programmer to test any code on it...
Thx
Daniel
Hi!
Does anybody ever tried somthing with a DS89C4[3/4/5]0 Microcontroller? Ive 2 of them and tried to communicate with the ROM-Loader (which should be onchip) - but without success.
Ive set it up on a problem-board, with a xtal (12mhz) and pulled the rst high, the /EA and /PSEN low (as mentioned in the datasheet).
A max232 to the UART0 (RXD0, TXD0) and a PC with serial-terminal-prog on the other side. The datasheet says, that the Micro should autodetect the baud-rate (upon a <CR>) and than return a initial Banner (some ascii text) to the terminalprog... But nothing happens. The xtal is running (oszilloscope).
What may be wrong? Any idea?
Ive no paralell-programmer to test any code on it...
Thx
Daniel