Datasheet

Monitor ROM (MON)
Functional Description
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Monitor ROM (MON) 191
Figure 15-1. Monitor Mode Circuit
+
+
+
V
DDA
MC145407
MC74HC125
RST
IRQ
V
DDA
CGMXFC
OSC1
OSC2
V
SS
V
DD
PTA0
V
DD
10 k Ω
0.1 µ F
10 k
Ω
6
5
2
4
3
1
DB-25
2
3
7
20
18
17
19
16
15
V
DD
V
DD
V
DD
10 µ F
10
µ F10 µ F
10
µ F
1
2
4
7
14
3
0.1
µ F
56
+
PTB0
PTB1
68HC08
$FFFF
$FFFE
RESET VECTORS
V
SSAD
/V
REFL
V
SSA
V
DDAD
/V
REFH
D
C
C
C
D
D
6–30 pF
6–30 pF
32.768 kHz XTAL
10 M
Ω
SW2
SW4
SW3
(SEE NOTE 2)
(SEE NOTES 2
(SEE NOTE 2)
(SEE NOTE 3)
Notes:
1. SW2, SW3, and SW4: Position C — Enter monitor mode using external oscillator.
SW2, SW3, and SW4: Position D — Enter monitor mode using external XTAL and internal PLL.
2. See . Monitor Mode Signal Requirements and Options for IRQ
voltage level requirements.
10 k
0.01
µ
F
0.033 µF
V
TST
330 k Ω
AND 3)
PTA1
V
DD
10 k Ω
10 k Ω
10 k Ω
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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