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MC68HC908GP20 Datasheet, PDF (207/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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0.1 µF
68HC08
RST
1
+
10 µF
3
4
10 µF
+2
MC145407
VTST
(SEE NOTE 3)
10 kâ¦
C
C
D
(SEE NOTES 2
SW2 AND 3)
VDDA
10 k
0.47 µF
RESET VECTORS
$FFFE
$FFFF
IRQ
VDDA
CGMXFC
20
6â30 pF
C
SW3
(SEE NOTE 2)
+
10 µF
18
32.768 kHz XTAL
D
SW4
C
(SEE NOTE 2)
17
+
10 µF
VDD
330 k⦠D
6â30 pF
19
OSC1
OSC2
PTA7
VSS
VSSAD/VREFL
VSSA
DB-25
2
5
3
6
7
16
VDD
15
VDD
VDDAD/VREFH
0.1 µF
VDD
1
14
MC74HC125
2
3
VDD
10 kâ¦
6
5
4
VDD
7
VDD
A
SW1
(SEE NOTE 1)
B
PTA0
PTC3
PTC0
PTC1
Notes:
1. For monitor mode entry when IRQ = VTST:
SW1: Position A â Bus clock = CGMXCLK ÷ 4 or CGMVCLK ÷ 4
SW1: Position B â Bus clock = CGMXCLK ÷ 2
2. SW2, SW3, and SW4: Position C â Enter monitor mode using external oscillator.
SW2, SW3, and SW4: Position D â Enter monitor mode using external XTAL and internal PLL.
3. See Table 15-1 for IRQ voltage level requirements.
Figure 15-1. Monitor Mode Circuit
MC68HC908GP20 â Rev 2.1
Freescale Semiconductor
Advance Information
207
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