Motorola MC68HC908AB32 - Monitor Mode Circuit

Monitor ROM (MON)
Functional Description
MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA Monitor ROM (MON) 159
Figure 10-1. Monitor Mode Circuit
+
+
+
+
10 M Ω
X1
V
DD
V
TST
MC145407
MC74HC125
RST
IRQ
OSC1
OSC2
V
SS
V
DD
PTA0
V
DD
10 k Ω
0.1 µ F
10
Ω
6
5
2
4
3
1
DB-25
2
3
7
20
18
17
19
16
15
V
DD
V
DD
V
DD
20 pF
20 pF
10
µ F
10 µ F10 µ F
10
µ F
1
2
4
7
14
3
0.1 µ F
4.9152 MHz
10 k
Ω
PTC3
V
DD
10 k Ω
B
A
NOTES:
Position B — Bus clock = CGMXCLK ÷ 2
(See
NOTES)
56
PTC0
PTC1
V
DD
10 k Ω
Position A — Bus clock = CGMXCLK ÷ 4 or CGMVCLK ÷ 4
V
CGMXFC
0.1 µ F
V
DD A
V
DD A
MC68HC908AB32