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| MC68HC908KX8 Datasheet, PDF (258/310 Pages) Motorola, Inc – Microcontrollers | |||
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Monitor ROM (MON)
NOTE:
While the voltage on IRQ1 is at VTST, the ICG module is bypassed and
the external square-wave clock becomes the clock source. Dropping
IRQ1 to below VTST will remove the bypass and the MCU will revert to
the clock source selected by the ICG (as determined by the settings in
the ICG registers).
VDD
10 kâ¦
0.1 µF
VTST
1 kâ¦
1
+
10 µF
3
4
10 µF
+2
DB-25
2
5
3
6
7
MC145407
20
+
10 µF
18
17
+
10 µF
VDD
19
0.1 µF
VDD
0.1 µF
9.8304-MHz
CANNED
OSCILLATOR
16
VDD
1
14
VDD
15
MC74HC125
2
3
10 kâ¦
6
5
4
7
68HC908KX8
RST (PTB7/OSC2)
IRQ1
VDD
VSS
OSC1
PTA0
QU7 ÃQUYHP9
Technical Data
258
VDD
10 kâ¦
PTB0 (PTXMOD0)
PTA1 (T@SD6GÃT@G@8U
Figure 18-1. Normal Monitor Mode Circuit
MC68HC908KX8 ⢠MC68HC908KX2 ⢠MC68HC08KX8 â Rev. 1.0
Monitor ROM (MON)
MOTOROLA
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