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M68HC08 датащи(PDF) 76 Page - Freescale Semiconductor, Inc

номер детали M68HC08
подробное описание детали  M68HC08 Microcontrollers
PDF  172 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 датащи(HTML) 76 Page - Freescale Semiconductor, Inc

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Monitor ROM (MON)
MC68HC908JL3E Family Data Sheet, Rev. 3
76
Freescale Semiconductor
Figure 7-1. Monitor Mode Circuit
NOTES:
1. Monitor mode entry method:
SW1: Position A — High voltage entry (VTST)
Clock source must be EXT OSC or XTAL CIRCUIT.
Bus clock depends on SW2.
SW1: Position B — Reset vector must be blank ($FFFE = $FFFF = $FF)
Bus clock = OSC1 ÷ 4.
2. Affects high voltage entry to monitor mode only (SW1 at position A):
SW2: Position C — Bus clock = OSC1 ÷ 4
SW2: Position D — Bus clock = OSC1 ÷ 2
5. See Table 16-4 for VDD + VHI voltage level requirements.
RST
IRQ
OSC1
OSC2
VSS
PTB0
20 pF
20 pF
0.1
µF
9.8304MHz
PTB1
VDD
0.1
µF
VDD
PTB2
VDD
10 k
PTB3
VDD
10 k
10 k
SW2
C
D
VDD
(SEE NOTE 2)
A
B
XTAL CIRCUIT
16
15
2
6
VDD
MAX232
V+
V–
VDD
10 k
C1+
C1–
5
4
C2+
C2–
+
3
1
1
µF
+
+
+
8
7
DB9
2
3
5
10
9
+
1
2
3
4
5
6
74HC125
74HC125
1 k
VDD + VHI
VCC
GND
1
µF
1
µF
1
µF
1
µF
8.5 V
VDD
10 k
10 k
(50% DUTY)
OSC1
(SEE NOTE 1)
SW1
VDD
OSC1
OSC2
See Figure 16-1 for component
values vs. frequency.
H(R)C908JL3E
H(R)C908JK3E
H(R)C908JK1E
EXT OSC
OSC2
RC CIRCUIT
FOR MC68HC908JL3E/JK3E/JK1E
SW1 AT POSITION A OR B
FOR MC68HRC908JL3E/JK3E/JK1E
SW1 MUST BE AT POSITION A
FOR MC68HC908JL3E/JK3E/JK1E
SW1 AT POSITION A OR B
FOR MC68HRC908JL3E/JK3E/JK1E
SW1 MUST BE AT POSITION B



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