MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 119

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC908JL8
MOTOROLA
NOTES:
1. Monitor mode entry method:
2. Affects high voltage entry to monitor mode only (SW1 at position A):
5. See
1 µ F
1 µ F
2
3
5
DB9
SW1: Position A — High voltage entry (V
SW1: Position B — Reset vector must be blank ($FFFE = $FFFF = $FF)
SW2: Position C — Bus clock = OSC1 ÷ 4
SW2: Position D — Bus clock = OSC1 ÷ 2
Table 19-4
+
+
1
3
4
5
7
8
C1+
C1–
C2+
C2–
for V
—
Rev. 2.0
MAX232
TST
Bus clock depends on SW2.
Bus clock = OSC1 ÷ 4.
voltage level requirements.
GND
V
V+
V–
CC
16
15
2
10
6
9
Freescale Semiconductor, Inc.
For More Information On This Product,
V
DD
Figure 9-1. Monitor Mode Circuit
+
+
1 µ F
TST
1 µ F
2
)
74HC125
1
Go to: www.freescale.com
+
3
EXT OSC CONNECTION TO OSC1, WITH OSC2
UNCONNECTED, CAN REPLACE XTAL CIRCUIT.
1 µ F
Monitor ROM (MON)
74HC125
6
V
TST
4
V
DD
5
V
EXT OSC (50% DUTY)
DD
XTAL CIRCUIT
10 k
20 pF
1 k
9.8304MHz
(SEE NOTE 2)
8.5 V
10 k
10 k
20 pF
A
B
C
D
OSC1
V
DD
10 k
SW1
SW2
0.1 µ F
(SEE NOTE 1)
V
DD
Functional Description
10 k
0.1 µ F
V
Monitor ROM (MON)
10 k
DD
V
DD
Technical Data
RST
HC908JL8
V
V
OSC1
OSC2
IRQ
PTB0
PTB1
PTB3
PTB2
DD
SS
119