CHAPTER 4 HOW TO USE MINICUBE2 WITH 78K0 MICROCONTROLLER
User’s Manual U18371EJ1V0UM
66
(2) Automatically switching the reset signal via selector logic
Figure 4-14 illustrates the circuit connection for the case where the reset signal is switched automatically using
the selector logic, with or without MINICUBE2 connected. When using flash self programming, refer to Figure
4-15.
Caution The reset circuit is disconnected if flash self programming is performed (FLMD0 = HI) without
MINICUBE2 connected, so no signals can be input to the _RESET pin.
Figure 4-14. Circuit Connection for Automatically Switching Reset Signal with Selector Logic
(When Not Using Flash Self Programming)
Target connector
V
DD
1 to 10 k
Ω
HI: Side A
LOW: Side B
1 to 10 k
Ω
A
B
RESET_OUT
RESET_IN
FLMD0
Note
Target device
_RESET
Reset connector
RESET signal
Selector
Target connector
V
DD
1 to 10 k
Ω
HI: Side A
LOW: Side B
1 to 10 k
Ω
A
B
RESET_OUT
RESET_IN
FLMD0
Note
Target device
_RESET
Reset connector
RESET signal
Selector
Note
FLMD0 is high level when MINICUBE2 is connected, and FLMD0 is pulled down when MINICUBE2 is
not connected.
Figure 4-15. Circuit Connection for Automatically Switching Reset Signal with Selector Logic
(When Using Flash Self Programming)
_RESET
V
DD
10 k
Ω
Port X
1 k
Ω
Note
10 k
Ω
A
B
Target connector
RESET_OUT
RESET_IN
FLMD0
Target device
Reset connector
RESET signal
HI: Side A
LOW: Side B
FLMD0
_RESET
V
DD
10 k
Ω
Port X
1 k
Ω
Note
10 k
Ω
A
B
Target connector
RESET_OUT
RESET_IN
FLMD0
Target device
Reset connector
RESET signal
HI: Side A
LOW: Side B
FLMD0
Note
This circuit is designed for flash self programming, which controls the FLMD0 pin via ports.