MC68HC705J1A Datasheet, PDF (147/162 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
MC68HSR705J1A
RC Oscillator Connections (No External Resistor)
C.5 RC Oscillator Connections (No External Resistor)
For maximum cost reduction, the RC oscillator mask connections shown
in Figure C-2 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 MC68HSR705J1A, an
internal resistor is selected which yields typical internal oscillator
frequencies as shown in Figure C-3. The internal resistance for this
device is different than the resistance of the selectable internal resistor
on the MC68HC705J1A and the MC68HSC705J1A devices.
NOTE: This option is not available on the ROM version of this device
(MC68HC05J1A).
OSC1
R
OSC2
MCU
EXTERNAL CONNECTIONS LEFT OPEN
V_DD
C2 C1
V_SS
Figure C-2. RC Oscillator Connections (No External Resistor)
MC68HC705J1A — Rev. 4.0
MC68HSR705J1A
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Technical Data