Microcontrollers Data Sheet

Monitor ROM (MON)
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor 257
Figure 18-8. Monitor Mode Circuit
+
+
+
+
10 MΩ
X1
V
DD
V
HI
MC145407
MC74HC125
MC68HC908MR16/
RST
IRQ
CGMXFC
OSC1
OSC2
V
SSA
V
SS
V
DD
PTA0
V
DD
10 kΩ
0.1 µF
0.02 µF
10 kΩ
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 µF
10 µF10 µF
10 µF
1
2
4
7
14
3
0.1 µF
4.9152 MHz
10 kΩ
PTC2
V
DD
10 kΩ
B
A
S2 Position A — Bus clock = CGMXCLK ÷ 4 or CGMVCLK ÷ 4
S2 Position B — Bus clock = CGMXCLK ÷ 2
56
PWMGND
V
SSAD
V
REFL
V
DDA
0.1 µF
V
DDA
V
DDAD
0.1 µF
V
DDAD
V
REFH
0.1 µF
V
REFH
PTC3
PTC4
V
DD
10 kΩ
MC68HC908MR32
PTA7
V
DD
10 kΩ
A
B
S3
S1
S2
S3 Position A — Parallel communication
S3 Position B — Serial communication