CNVss to Vcc1 (should be done thru programmer adapter)
P50 (WRL (CE) pin 65 on M32C 144pins version) to Vcc1
P55 (HOLD (EPM) pin 54 on M32C 144pins version) to Vss
this should be sufficient, if not P85 (NMI pin 24 on M32C 144pins version) to Vcc1
Depending on programmers all Vss should be connected togehter ad all Vcc1=Vcc2 connected together
VVDI Prog is not the best tool to read this mcu if not worked, try with orange5 or new xprog 6.12.