MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 155

• Manufacturer Part Number: MC68HC908AP16CFA
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC908AP Family — Rev. 2.5
MOTOROLA
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 24-4
+
+
1
3
4
5
7
8
C1+
C1–
C2+
C2–
for V
MAX232
TST
Bus clock depends on SW1 (note 2).
Bus clock = 2.4576MHz.
voltage level requirements.
GND
V
V+
V–
CC
16
15
2
10
6
9
Freescale Semiconductor, Inc.
V
EXT OSC
For More Information On This Product,
MUST BE USED IF SW2 IS AT POSITION C.
CONNECT TO OSC1, WITH OSC2 UNCONNECTED.
DD
Figure 10-1. Monitor Mode Circuit
+
+
1 µF
TST
1 µF
2
); must use external OSC
74HC125
1
Go to: www.freescale.com
V
+
REG
3
1 µF
74HC125
4.9152MHz/9.8304MHz
6
V
TST
4
5
XTAL CIRCUIT
6–30 pF
(50% DUTY)
V
DD
10 k
32.768kHz
1 k
(SEE NOTE 2)
OSC1
8.5 V
6–30 pF
0.1 µF
330k
10 k
10 k
C
D
A
B
V
V
DD
DD
0.033 µF
SW2
SW1
10k
(SEE NOTE 1)
10 k
0.1 µF
Functional Description
10 k
Monitor ROM (MON)
V
DD
0.01 µF
Data Sheet
RST
HC908AP
V
V
V
V
V
V
V
CGMXFC
OSC1
OSC2
IRQ1
PTA0
PTA1
PTB0
PTA2
DD
DDA
REFH
REG
REFL
SS
SSA
155