2
EXTAL
MCU
XTAL
10 MΩ
25 pF *
4xE
CRYSTAL
25 pF *
* THIS VALUE INCLUDES ALL STRAY CAPACITANCES.
Figure 2-1 Common Crystal Connections
EXTAL
MCU
XTAL NC
4xE
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
COMMON XTAL CONN
Figure 2-2 External Oscillator Connections
EXT EXTAL CONN
EXTAL
FIRST
MCU
XTAL
10 MΩ
25 pF *
4xE
CRYSTAL
25 pF *
220 Ω
EXTAL
SECOND
MCU
NC
XTAL
* THIS VALUE INCLUDES ALL STRAY CAPACITANCES.
Figure 2-3 One Crystal Driving Two MCUs
DUAL-MCU XTAL CONN
MOTOROLA
2-2
SIGNAL DESCRIPTIONS AND OPERATING MODES
MC68HC11A8
TECHNICAL DATA