MC68HC908QY2CDW Datasheet, PDF (140/184 Pages) Freescale Semiconductor, Inc – Microcontrollers

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V_DD
V_DD
10 kΩ*
1 μF
1 μF
DB9
2
3
MAX232
1 _C1+
+
3 _C1–
4 _C2+
+
5 _C2–
7
8
V_DD
16
+
1 μF
15
1 μF
+
RST (PTA3)
9.8304 MHz CLOCK
OSC1 (PTA5)
V_TST
1 kΩ
V+ ²
V– ⁶
1 μF
10
9
V_DD
9.1 V
+
10 kΩ
74HC125
6
5
74HC125
2
3
4
IRQ (PTA2)
PTA0
1
5
V_DD
0.1 μF
V_DD
10 kΩ*
PTA1
10 kΩ*
PTA4
V_SS
* Value not critical
Figure 15-10. Monitor Mode Circuit (External Clock, with High Voltage)
N.C.
RST (PTA3)
1 μF
1 μF
DB9
2
3
MAX232
1 _C1+
+
3 _C1–
4 _C2+
+
5 _C2–
7
8
V_DD
16
15
V+ ²
V– ⁶
+
1 μF
1 μF
+
9.8304 MHz CLOCK
OSC1 (PTA5)
10 kΩ*
V_DD
IRQ (PTA2)
1 μF
+
10 kΩ
74HC125
10
6
5
74HC125
9
2
3
4
PTA0
5
1
V_DD
V_DD
0.1 μF
PTA1
N.C.
PTA4
N.C.
V_SS
* Value not critical
Figure 15-11. Monitor Mode Circuit (External Clock, No High Voltage)
MC68HC908QY/QT Family Data Sheet, Rev. 6
140
Freescale Semiconductor