mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 92

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Monitor ROM (MON)
92
NOTES:
1. Monitor mode entry method:
2. Affects high voltage entry to monitor mode only (SW2 at position C):
5. See
1 μF
1 μF
2
3
5
DB9
SW2: Position C — High voltage entry (V
SW2: Position D — Reset vector must be blank ($FFFE:$FFFF = $FF)
SW1: Position A — Bus clock = OSC1 ÷ 4
SW1: Position B — Bus clock = OSC1 ÷ 2
Table 19-4. DC Electrical Characteristics
+
+
7
8
1
3
4
5
C1+
C1–
C2+
C2–
MAX232
Bus clock depends on SW1 (note 2).
Bus clock = 1.2288MHz.
GND
V
V+
V–
CC
16
15
2
10
6
9
V
EXT OSC
MUST BE USED IF SW2 IS AT POSITION C.
CONNECT TO OSC1, WITH OSC2 UNCONNECTED.
DD
+
+
1 μF
TST
Figure 7-1. Monitor Mode Circuit
1 μF
2
MC68HC908JW32 Data Sheet, Rev. 5
for V
); must use external OSC
74HC125
1
TST
V
+
REG
3
1 μF
voltage level requirements.
74HC125
4.9152MHz/9.8304MHz
6
V
TST
4
5
XTAL CIRCUIT
6–30 pF
(50% DUTY)
V
DD
10 k
4.9152MHz
1 k
(SEE NOTE 2)
OSC1
8.5 V
6–30 pF
0.1 μF
10k
10 k
C
D
A
B
1M
V
V
DD
DD
0.22 μF
SW2
SW1
0.1 μF
10k
1k
(SEE NOTE 1)
Freescale Semiconductor
10 k
0.1 μF
10k
V
DD
V
10 nF
DD
RST
HC908JW32
V
V
V
V
CGMXFC
OSC1
OSC2
IRQ
PTA0
PTA1
PTC1
PTA2
DD
DDPLL
SSPLL
SS