MC68HC705KJ1CDW Freescale Semiconductor, MC68HC705KJ1CDW Datasheet - Page 16

• Manufacturer Part Number: MC68HC705KJ1CDW
• Description: IC MCU 4MHZ 1.2K OTP 16-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705KJ1CDW

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 10
• Program Memory Size: 1.2KB (1.2K x 8)
• Program Memory Type: OTP
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

Introduction
1.4.1 V
V
Very fast signal transitions occur on the MCU pins, placing high, short-duration current demands on the
power supply. To prevent noise problems, take special care, as
capacitors as close as possible to the MCU. C2 is an optional bulk current bypass capacitor for use in
applications that require the port pins to source high current levels.
1.4.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The oscillator can be driven by
any of the following:
The frequency, f
operating frequency, f
1.4.2.1 Crystal Oscillator
Figure 1-4
Follow the crystal supplier’s recommendations, as the crystal parameters determine the external
component values required to provide reliable startup and maximum stability. The load capacitance
values used in the oscillator circuit design should include all stray layout capacitances.
To minimize output distortion, mount the crystal and capacitors as close as possible to the pins. An
internal startup resistor of approximately 2 MΩ is provided between OSC1 and OSC2 for the crystal
oscillator as a programmable mask option.
16
DD
1. Standard crystal (See
2. Ceramic resonator (See
3. Resistor/capacitor (RC) oscillator (Refer to
4. External clock signal as shown in (See
5. Low speed (32 kHz) crystal connections (Refer to
and V
DD
SS
and
and V
are the power supply and ground pins. The MCU operates from a single power supply.
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
Figure 1-5
OSC
SS
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
, of the oscillator or external clock source is divided by two to produce the internal
MCU
OP
.
Figure 1-3. Bypassing Layout Recommendation
show a typical crystal oscillator circuit for an AT-cut, parallel resonant crystal.
V
V
DD
SS
0.1 µF
Figure 1-4
C1
Figure 1-6
V+
+
C2
and
and
Figure
Figure
Figure
NOTE
Appendix A
1-5.)
1-8.)
1-7.)
C2
Appendix B
C1
MC68HRC705KJ1.)
Figure 1-3
V
V
SS
DD
MC68HLC705KJ1.)
shows, by placing the bypass
Freescale Semiconductor