Datasheet

User’s Manual U18698EJ1V0UD
526
CHAPTER 25 ON-CHIP DEBUG FUNCTION
25.1 Connecting QB-78K0MINI to 78K0/LC3
The 78K0/LC3 uses the V
DD, FLMD0, RESET, OCD0A/X1, OCD0B/X2, and VSS pins to communicate with the host
machine via an on-chip debug emulator (QB-78K0MINI).
Caution The 78K0/LC3 has an on-chip debug function. Do not use this product for mass production
because its reliability cannot be guaranteed after the on-chip debug function has been used,
given the issue of the number of times the flash memory can be rewritten. NEC Electronics does
not accept complaints concerning this product after the on-chip debug function has been used.
Figure 25-1. Connection Example of QB-78K0MINI and 78K0/LC3
(When OCD0A/X1 and OCD0B/X2 Are Used)
V DD
78K0/LC3
FLMD0
OCD0A/X1
OCD0B/X2
Target reset
RESET_IN
X2
X1
FLMD0
RESET
V
DD
RESET_OUT
GND
QB-78K0MINI target connector
GND
Note
Note Make pull-down resistor 470 Ω or more (10 kΩ: recommended).
Caution Input the clock from the OCD0A/X1 pin during on-chip debugging.