I received 12 units of 40X1 directly from Tech Supplies in December.
I am using them to receive signals from some 08M chips, via Xbee.
The 08M chips are set to 4800 baud.
Of the 12 chips received, I found that 8 of the chips would not take a download at all.
The 4 chips that would take a download, would work OK otherwise but would not receive the serial strings from the 08M and xbee.
After a while, I found I had to use calibfreq -6 to get them to receive the serial string.
Fortunately I had 3 units of the old 40X chips and they worked no problems, which allowed me to track down the problem rather quickly.
So did I get a bad batch of chips? That is my only conclusion, but I would like some input from Technical whether there is a bad batch floating around.
I used 4mhz crystals with 22p caps after my initial internal resonator woes, but this did not fix the problem. This points to a firmware issue. As serial reception should be rock solid with an external crystal, and it rules out the 08M chips being "over clocked" because the old 40X chips worked just fine.
Having to calibfreq -6 is quite extreme. I bet the ones that don't download are too far out of the operating range to pick up the download string.
Firmware is V1.2, and I am using version 5.1.5 of the programming editor.
I am using them to receive signals from some 08M chips, via Xbee.
The 08M chips are set to 4800 baud.
Of the 12 chips received, I found that 8 of the chips would not take a download at all.
The 4 chips that would take a download, would work OK otherwise but would not receive the serial strings from the 08M and xbee.
After a while, I found I had to use calibfreq -6 to get them to receive the serial string.
Fortunately I had 3 units of the old 40X chips and they worked no problems, which allowed me to track down the problem rather quickly.
So did I get a bad batch of chips? That is my only conclusion, but I would like some input from Technical whether there is a bad batch floating around.
I used 4mhz crystals with 22p caps after my initial internal resonator woes, but this did not fix the problem. This points to a firmware issue. As serial reception should be rock solid with an external crystal, and it rules out the 08M chips being "over clocked" because the old 40X chips worked just fine.
Having to calibfreq -6 is quite extreme. I bet the ones that don't download are too far out of the operating range to pick up the download string.
Firmware is V1.2, and I am using version 5.1.5 of the programming editor.