MC68HC705J1ACPE Datasheet, PDF (147/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

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
For More Information On This Product,
Go to: www.freescale.com
Technical Data