Datasheet

Development Support
MC68HC908QY/QT Family Data Sheet, Rev. 6
140 Freescale Semiconductor
Figure 15-10. Monitor Mode Circuit (External Clock, with High Voltage)
Figure 15-11. Monitor Mode Circuit (External Clock, No High Voltage)
9.8304 MHz CLOCK
+
10 kΩ*
V
DD
10 kΩ*
RST (PTA3)
IRQ
(PTA2)
PTA0
OSC1 (PTA5)
8
7
DB9
2
3
5
16
15
2
6
10
9
V
DD
MAX232
V+
V–
1 μF
+
1
2
3
4
5
6
74HC125
74HC125
10 kΩ
PTA1
PTA4
V
SS
0.1 μF
V
DD
1 k Ω
9.1 V
C1+
C1–
5
4
1 μF
C2+
C2–
+
3
1
1 μF
+
1 μF
V
DD
+
1 μF
V
TST
* Value not critical
V
DD
V
DD
10 kΩ*
RST (PTA3)
IRQ
(PTA2)
PTA0
OSC1 (PTA5)
8
7
DB9
2
3
5
16
15
2
6
10
9
V
DD
1 μF
MAX232
V+
V–
V
DD
1 μF
+
1
2
3
4
5
6
74HC125
74HC125
10 kΩ
N.C.PTA1
N.C.PTA4
V
SS
0.1 μF
V
DD
9.8304 MHz CLOCK
C1+
C1–
5
4
1 μF
C2+
C2–
+
3
1
1 μF
+
+
+
1 μF
V
DD
10 kΩ*
* Value not critical
N.C.