MC68HC705JP7 Datasheet, PDF (31/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
General Description
OSC1 and OSC2 Pins
of approximately 2 MΩ can be provided between OSC1 and OSC2 for
the ceramic resonator type oscillator by use of the OSCRES bit in the
MOR.
1.7.3 RC Oscillator
The lowest cost oscillator is the RC oscillator configuration where a
resistor is connected between the two oscillator pins as shown
in Figure 1-3 (b).
The selection of the RC oscillator configuration is done by product part
number selection as described in Section 17. Ordering Information.
NOTE: Do not use the internal startup resistor between OSC1 and OSC2 for the
RC-type oscillator.
1.7.4 External Clock
An external clock from another CMOS-compatible device can be
connected to the OSC1 input, with the OSC2 input not connected, as
shown in Figure 1-3 (c). This oscillator can be selected via software.
This configuration is possible regardless of whether the crystal/ceramic
resonator or RC oscillator configuration is used.
NOTE: Do not use the internal startup resistor between OSC1 and OSC2 for the
external clock.
1.7.5 Internal Low-Power Oscillator
An internal low-power oscillator (LPO) is provided which is the default
oscillator out of reset. When operating from this internal LPO, the other
oscillator can be powered down by software to further conserve power.
The selection of the LPO configuration is done by product part number
selection as described in Section 17. Ordering Information.
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
General Description
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Advance Information
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