MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 157

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Monitor ROM (MON)
Technical Data
158
DB-25
Notes:
10 µF
10 µF
2
3
7
1. For monitor mode entry when IRQ = V
2. SW2, SW3, and SW4: Position C — Enter monitor mode using external oscillator.
3. See
+
+
SW2, SW3, and SW4: Position D — Enter monitor mode using external XTAL and internal PLL.
SW1: Position A — Bus clock = CGMXCLK ÷ 4 or CGMPCLK ÷ 4
SW1: Position B — Bus clock = CGMXCLK ÷ 2
1
3
4
2
5
6
23.6 5.0V DC Electrical Characteristics
MC145407
Figure 10-1. Monitor Mode Circuit
EXTERNAL OSCILLATOR
MUST BE USED FOR
MONITOR MODE ENTRY
WHEN IRQ = V
20
18
17
19
16
15
+
+
10 µF
10 µF
32.768 kHz XTAL
Monitor ROM (MON)
TST
6–30 pF
TST
V
1
2
6
4
7
DD
:
MC74HC125
(SEE NOTE 3)
for IRQ voltage level requirements.
6–30 pF
330 kΩ
(SEE NOTE 1)
10 kΩ
14
3
5
V
D
C
C
C
D
V
V
TST
DD
D
DD
A
SW2
SW4
(SEE NOTE 2)
SW3
(SEE NOTE 2)
B
0.033 µF
(SEE NOTES 2
10 kΩ
SW1
0.1 µF
0.1 µF
AND 3)
10 kΩ
V
V
DD
DD
V
DD
V
RST
IRQ
CGMXFC
OSC1
OSC2
V
V
V
V
PTA0
PTC1
PTA1
PTA2
MC68HC908LJ12
DDA
SS
REFL
DD
REFH
68HC908LJ12
Freescale Semiconductor
RESET VECTORS
$FFFE
$FFFF
—
Rev. 2.1