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M68HC08 Datasheet(PDF) 125 Page - Freescale Semiconductor, Inc

Part # M68HC08
Description  MC68HC908JB16 Technical Data
PDF  332 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 125 Page - Freescale Semiconductor, Inc

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Monitor ROM (MON)
MC68HC908JB16 — Rev. 1.1
Technical Data
Freescale Semiconductor
Monitor ROM (MON)
125
Figure 9-1. Monitor Mode Circuit
+
+
+
+
MC145407
MC74HC125
HC908JB16
RST
IRQ
OSC1
OSC2
VSS
PTA0
VDD
10 k
Ω
10k
Ω
6
5
2
4
3
1
DB-25
2
3
7
20
18
17
19
16
15
VDD
V
DD
20 pF
20 pF
10
µF
10
µF
10
µF
10
µF
1
2
4
7
14
3
0.1
µF
12MHz
5
6
PTA1
VDD
0.1
µF
VDD
PTA2
VDD
10 k
Ω
PTA3
VDD
10 k
Ω
10 k
Ω
SW1
A
B
VTST
SW2
E
F
(SEE NOTE 2)
NOTES:
1. Affects high voltage entry to monitor mode only (SW2 at position C):
SW1: Position A — Bus clock = fXCLK ÷ 2
SW1: Position B — Bus clock = fXCLK
2. SW2: Position C — High-voltage entry to monitor mode.
SW2: Position D — Low-voltage entry to monitor mode (with blank reset vector).
See Section 20. for IRQ voltage level requirements.
3. SW3: Position E — OSC1 directly driven by external oscillator.
SW3: Position F — OSC1 driven by crystal oscillator circuit.
10k
Ω
V
DD
V
DD
(SEE NOTE 3)
(SEE NOTE 1)
E
F
C
D
12MHz
SW3
fXCLK
VREG
4.7
µF
0.1
µF
+
PTE3
VDD
10 k
Ω



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