aminorjourney wrote:I assume they're for debugging and/or programming.
Anyone have any ideas what they are? And why some of us have them, and some don't?
Thanks for posting those pictures. Very helpful.
Yes, they are most likely for debugging or probing. CN2 connects to the microcontroller's serial port 1. CN2 Pins 1 thru 4 are mapped to the processors pin 31 thru 27. So Pin 4 is TxD1 and Pin3 is RxD1. One of Pin 5 or 6 must be GND.
Anyone up for a level-shifter on TxD to see if there is any interesting output?
BTW One of the microcontroller's serial ports is used to talk to the A/C compressor. Before any probing is done it should be ruled out that TxD does not just connect to Pin 14 of the M50 connector.
I could not trace CN2 completely from my pictures. I would need the board in front of me. Pin 1 goes near the processor though. 2/3 are probably VCC/GND.
BTW the processor is a M30290FATHP
from the Renesas M16C Tiny series.
16 bit 20 MHz Microcontroller
96K Code Flash
4 K Data flash
8K RAM
Input timer : 3
Output timer : 5
Input capture : 8
Output compare : 8
10-bit A/D converter : 24ch (80pin)
Serial I/O : 5
Watchdog timer : 1
3-Phase Inverter control : 6
Multi master I2C-bus
CRC calculation circuit
PLL
CAN : 1ch
Packaging is a 80P6Q
Hardware manual:
http://documentation.renesas.com/doc/pr ... 6c29hm.pdf" onclick="window.open(this.href);return false;
Other info:
http://www.renesas.com/products/mpumcu/ ... 0FATHP.jsp" onclick="window.open(this.href);return false;