MC68HC05P18 Datasheet, PDF (23/144 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
General Description
Functional Pin Description
TO V_DD (OR STOP)
MCU
TO V_DD (OR STOP)
MCU
OSC1
4.7 MΩ
OSC2
OSC1
OSC2
UNCONNECTED
37 pF
37 pF
EXTERNAL CLOCK
(a)
Crystal or Ceramic
Resonator Connections
(b)
External Clock Source
Connections
Figure 1-3. Oscillator Connections
1.5.4 Reset (RESET)
Driving this input low will reset the MCU to a known startup state. As an
output, the RESET pin indicates that an internal MCU reset has
occurred. The RESET pin contains an internal Schmitt trigger to improve
its noise immunity. Refer to Section 5. Resets.
1.5.5 Port A (PA0–PA7)
These eight I/O pins comprise port A. The state of any pin is software
programmable and all port A lines are configured as inputs during
power-on or reset. For the MC68HC05P18, eight mask options can be
chosen to enable pullups and interrupts (active low) on the port A pins.
For the MC68HC805P18, the pullups and interrupt options (active low)
on the port A pins can be individually programmed in the mask option
register 2 (MOR2).
For further information, refer to Section 4. Interrupts and Section 7.
Input/Output (I/O) Ports.
MC68HC(8)05P18 — Rev. 2.0
MOTOROLA
General Description
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Advance Information
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