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| MC68HC705KJ1 Datasheet, PDF (103/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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RC Oscillator Connections (No External Resistor)
A.4 RC Oscillator Connections (No External Resistor)
For maximum cost reduction, the RC oscillator mask connections shown in Figure A-3 allow the on-chip
oscillator to be driven with no external components. This can be accomplished by programming the
oscillator internal resistor (OSCRES) bit in the mask option register to a logic 1. When programming the
OSCRES bit for the MC68HRC705KJ1, an internal resistor is selected which yields typical internal
oscillator frequencies as shown in Figure A-4. The internal resistance for this device is different than the
resistance of the selectable internal resistor on the MC68HC705KJ1 and the MC68HRC705KJ1 devices.
OSC1
R
OSC2
MCU
(EXTERNAL CONNECTIONS LEFT OPEN)
VDD
C2 C1
VSS
Figure A-3. RC Oscillator Connections (No External Resistor)
MC68HC705KJ1 ⢠MC68HRC705KJ1 ⢠MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
103
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