mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 125

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908JB16
Freescale Semiconductor
NOTES:
1. Affects high voltage entry to monitor mode only (SW2 at position C):
2. SW2: Position C — High-voltage entry to monitor mode.
3. SW3: Position E — OSC1 directly driven by external oscillator.
SW2: Position D — Low-voltage entry to monitor mode (with blank reset vector).
See
SW3: Position F — OSC1 driven by crystal oscillator circuit.
DB-25
10 µF
10 µF
SW1: Position A — Bus clock = f
SW1: Position B — Bus clock = f
2
3
7
Section 20.
+
+
1
3
4
2
5
6
—
for IRQ voltage level requirements.
Rev. 1.1
MC145407
XCLK
XCLK
Figure 9-1. Monitor Mode Circuit
20
18
17
19
16
15
(SEE NOTE 2)
÷ 2
+
+
10 µF
10 µF
10k Ω
Monitor ROM (MON)
V
V
DD
DD
12MHz
V
DD
20 pF
10k Ω
1
2
6
4
7
C
D
V
12MHz
MC74HC125
TST
(SEE NOTE 3)
4.7 µF
SW2
20 pF
(SEE NOTE 1)
+
14
3
5
0.1 µF
E
E
F
F
V
DD
10 kΩ
SW3
A
B
0.1 µF
V
DD
10 kΩ
SW1
0.1 µF
10 kΩ
10 kΩ
10 kΩ
f
V
XCLK
DD
V
V
DD
DD
V
Monitor ROM (MON)
DD
Technical Data
HC908JB16
RST
IRQ
V
V
V
OSC1
OSC2
PTA3
PTA0
PTA1
PTE3
PTA2
REG
DD
SS
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