MC68HC05RC17 Datasheet, PDF (23/128 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Description
Signal Description
An external clock should be applied to the OSC1 input with the OSC2 pin
not connected (see Figure 1-4 (b)). This setup can be used if the user
does not want to run the CPU with a crystal.
NOTE: The PLL design requires a 32.768-kHz external frequency for proper
operation.
1.5.4 RESET
1.5.5 LPRST
OSC1
MCU
OSC2
10 MΩ
30 pF
30 pF
MCU
OSC1
OSC2
UNCONNECTED
< EXTERNAL CLOCK
(a) Crystal/Ceramic Resonator
Oscillator Connections
(b) External Clock Source
Connections
Figure 1-4. Oscillator Connections
This active-low pin is used to reset the MCU to a known startup state by
pulling RESET low. The RESET pin contains an internal Schmitt trigger
as part of its input to improve noise immunity. See Section 5. Resets.
The LPRST pin is an active-low pin and is used to put the MCU into low-
power reset mode. In low-power reset mode the MCU is held in reset
with all processor clocks halted. See Section 5. Resets.
MC68HC05RC17 — Rev. 2.0
General Release Specification
General Description
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