mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 165

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
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 F
10 F
SW1: Position A — Bus clock = f
SW1: Position B — Bus clock = f
2
3
7
Section 18
+
+
1
3
4
2
5
6
for IRQ voltage level requirements.
MC145407
XCLK
XCLK
Figure 10-1. Monitor Mode Circuit
20
18
17
19
16
15
(SEE NOTE 2)
÷ 2
+
+
10 F
10 F
10k
Monitor ROM (MON)
V
V
DD
DD
V
6MHz
DD
20 pF
10k
1
2
6
4
7
V
DD
C
D
6MHz
MC74LCX125
+ V
HI
(SEE NOTE 3)
4.7 F
SW2
20 pF
(SEE NOTE 1)
+
14
3
5
0.1 F
E
F
E
F
3.3V
10 k
SW3
A
B
3.3V
0.1 F
10 k
SW1
0.1 F
10 k
10 k
f
V
XCLK
DD
3.3V
Functional Description
3.3V
Monitor ROM (MON)
Technical Data
RST
HC908JB8
IRQ
V
V
V
OSC1
OSC2
PTA3
PTA0
PTA1
PTA2
REG
DD
SS
165