NEC V850ES/F 3-L Series User Manual page 273

Flash Memory
(2)
Serial I/O signals
Figure 7-9
RESET
Figure 7-10
Potential conflicts with on-board signal connections
If other devices are connected to the serial interface pins in use for flash
memory programming in on-board programming mode take care that the
concerned signals do not conflict with the signals of the flash programmer and
the microcontroller. Output pins of the other devices must be isolated or set in
high impedance state. Ensure that the other devices do not malfunction
because of flash programmer signals.
V850 µC
output
V850 µC
input
V850 µC
input
Potential conflicts with serial interfaces signals
Pay attention in particular if the flash programmer's RESET signal is connected
also to an on-board reset generation circuit. The reset output of the reset
generator may ruin the flash programming process and may need to be
isolated or disabled.
V850 µC
RESET
Potential conflict with RESET
User's Manual U18743EE1V2UM00
Flash programmer
Other
input
device
isolate or disable
Flash programmer
Other
input
device
isolate or disable
Flash programmer
Other
input
device
isolate or disable
or Hi-Z
Flash programmer
Reset generator
RESET
isolate or disable
Chapter 7
273