NEC V850/SB1TM User Manual page 429

(1) Conflict of signals
When connecting a dedicated flash programmer (output) to a serial interface pin (input) that is connected to
another device (output), conflict of signals occurs. To avoid the conflict of signals, isolate the connection to the
other device or set the other device to the output high-impedance status.
V850/SB1, V850/SB2
Input pin
CHAPTER 18
Figure 18-6. Conflict of Signals (Serial Interface Input Pin)
Conflict of signals
In the flash memory programming mode, the signal that the
dedicated flash programmer sends out conflicts with signals
another device outputs. Therefore, isolate the signals on the
other device side.
User's Manual U13850EJ4V0UM
FLASH MEMORY
Dedicated flash programmer connection pins
Other device
Output pin
429