MC68HC11P2 Datasheet, PDF (25/268 Pages) Motorola, Inc – Microcontrollers

(a) Common crystal
connections
Freescale Semiconductor, Inc.
Pin Descriptions
Crystal driver and external clock input (XTAL, EXTAL)
In all cases, use caution when designing circuitry associated with the
oscillator pins. Load capacitances shown in the oscillator circuits include
all stray layout capacitances. See Figure 2-3.
EXTAL
M68HC11
10 M¾
XTAL
4•E
crystal
25 pF
25 pF
(b) External oscillator
connections
EXTAL
M68HC11
XTAL
External oscillator
NC or
10–100k¾ load
EXTAL
M68HC11
10 M¾
XTAL
4•E
crystal
(c) One crystal driving two MCUs
25 pF
25 pF
220 ¾
EXTAL
M68HC11
NC or
10–100 k¾
load
XTAL
Note: capacitor values include all stray capacitance.
Figure 2-3. Oscillator connections
MC68HC11P2 — Rev 1.0
Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
Technical Data