CHAPTER 5 HOW TO USE MINICUBE2 WITH 78K0S MICROCONTROLLER
User’s Manual U18371EJ1V0UM
109
5.1.5 Connection of X1 and X2 pins
The X1 and X2 pins are used when the debugger is started for the first time (when downloading the monitor
program) and when programming is performed with the QB-Programmer. Design circuits appropriately according
to the relevant case among the cases shown below.
(1) X1 and X2 pins are not used in target system
→
See
Figure 5-10
.
(2) X1 and X2 pins are used in target system
→
See
Figure 5-11
and
5.2.6
Debugging of alternate-functions of X1 and X2 pins
.
Figure 5-10. Circuit Connection for the Case Where X1 and X2 Pins Are Not Used in Target System
Target connector
X2
3
X2
V
DD
3 to 10 k
Ω
Target device
X1
X1
9
1 to 10 k
Ω
Target connector
X2
3
X2
V
DD
3 to 10 k
Ω
Target device
X1
X1
9
1 to 10 k
Ω
Figure 5-11. Circuit Connection for the Case Where X1 and X2 Pins Are Used in Target System
Target connector
X2
3
X2
Target device
X1
X1
9
Oscillator or
external device
Jumper
Target connector
X2
3
X2
Target device
X1
X1
9
Oscillator or
external device
Jumper
* Jumper setting
When debugger is started for the first time
(downloading the monitor program) or when
programming is performed with QB-Programmer: 1-2 shorted
Other than above:
2-3 shorted
Remark
Refer to the pin connection in Figure 5-10 when the X1 or X2 pin is not used.
