MC68HC908JK3EMP MOTOROLA [Motorola, Inc], MC68HC908JK3EMP Datasheet - Page 109

• Manufacturer Part Number: MC68HC908JK3EMP
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68H(R)C908JL3E/JK3E/JK1E
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 18-4
+
+
1
3
4
5
7
8
C1+
C1–
C2+
C2–
for V
FOR MC68HRC908JL3E/JK3E/JK1E
MAX232
DD
SW1 MUST BE AT POSITION B
Clock source must be EXT OSC or XTAL CIRCUIT.
Bus clock depends on SW2.
Bus clock = OSC1 ÷ 4.
+ V
GND
HI
V
FOR MC68HRC908JL3E/JK3E/JK1E
V+
V–
CC
FOR MC68HC908JL3E/JK3E/JK1E
voltage level requirements.
SW1 MUST BE AT POSITION A
16
15
2
10
6
9
SW1 AT POSITION A OR B
V
RC CIRCUIT
—
DD
FOR MC68HC908JL3E/JK3E/JK1E
+
+
Figure 9-1. Monitor Mode Circuit
Rev. 2.0
1 µ F
1 µ F
TST
2
SW1 AT POSITION A OR B
74HC125
)
1
+
EXT OSC
3
1 µ F
V
Monitor ROM (MON)
DD
74HC125
XTAL CIRCUIT
6
V
DD
4
See
values vs. frequency.
+ V
V
DD
5
HI
Figure 18-1
V
(50% DUTY)
DD
10 k
20 pF
1 k
9.8304MHz
(SEE NOTE 2)
for component
8.5 V
10 k
10 k
20 pF
A
B
C
D
OSC1
OSC2
OSC1
OSC2
V
DD
10 k
SW1
SW2
0.1 µ F
(SEE NOTE 1)
V
DD
10 k
0.1 µ F
V
Functional Description
10 k
DD
V
Monitor ROM (MON)
DD
Technical Data
H(R)C908JL3E
H(R)C908JK3E
H(R)C908JK1E
RST
V
V
OSC1
OSC2
IRQ
PTB0
PTB1
PTB3
PTB2
DD
SS
109