MC68HC05P1ADW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P1ADW Datasheet - Page 18

• Manufacturer Part Number: MC68HC05P1ADW
• Description: General Release Specification
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

General Description
1.4 Mask Options
1.5 Functional Pin Description
1.5.1 V
General Release Specification
DD
and V
SS
The MC68HC05P1A has 12 mask options. The default state of these
mask options and their alternate states are:
The following paragraphs describe the functionality of each pin on the
MC68HC05P1A package. The device also is available with an alternate
pinout where V
emissions. This also improves the ability to decouple V
which may provide some benefit for conducted RF emissions as well.
The pinouts are shown in
compatible with the MC68HC05P1 microcontroller unit (MCU).
Power is supplied to the MCU through V
to a regulated +5 volt supply and V
Very fast signal transitions occur on the MCU pins. The short rise and
fall times place very high short-duration current demands on the power
supply. To prevent noise problems, take special care to provide good
power supply bypassing at the MCU. Use bypass capacitors with good
high-frequency characteristics, and position them as close to the MCU
as possible. Bypassing requirements vary, depending on how heavily
the MCU pins are loaded.
1. IRQ is Edge- and Level-Sensitive — Option for Edge-Sensitive
2. Crystal/Ceramic Resonator Oscillator Mode — Option for
3. COP Watchdog Timer Enabled — Option to Disable
4. Stop Instruction Enabled — Option to Convert to Halt
5. Eight (8) Port A Pullups/Interrupts Disabled — Option to
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Resistor/Capacitor (RC) Mode
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DD
General Description
and V
SS
Figure 1-2
are adjacent to reduce radio frequency (RF)
SS
and
is connected to ground.
DD
Figure
and V
MC68HC05P1A
1-3. They are
SS
. V
DD
DD
is connected
and V
—
SS
Rev. 3.0
,