MC68HC705JP7CDW Freescale Semiconductor, MC68HC705JP7CDW Datasheet - Page 17

• Manufacturer Part Number: MC68HC705JP7CDW
• Description: IC MCU 8BIT 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705JP7CDW

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SIO
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 22
• Program Memory Size: 6KB (6K x 8)
• Program Memory Type: OTP
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

1.5 V
Power is supplied to the MCU through V
MCU operates from a single power supply.
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, special care should be
taken to provide good power supply bypassing at the MCU by using bypass capacitors with good
high-frequency characteristics that are positioned as close to the MCU as possible.
1.6 OSC1 and OSC2 Pins
The OSC1 and OSC2 pins are the connections for the external pin oscillator (EPO). The OSC1 and OSC2
pins can accept these sets of components:
The selection of the crystal/ceramic resonator or RC oscillator configuration is done by product part
number selection as described in
The frequency, f
operating frequency, f
1.6.1 Crystal Oscillator
The circuit in
crystal manufacturer’s recommendations should be followed, as the crystal parameters determine the
external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup resistor of approximately 2 MΩ can be provided between
OSC1 and OSC2 for the crystal type oscillator by use of the OSCRES bit in the MOR.
Freescale Semiconductor
•
•
•
•
A crystal as shown in
A ceramic resonator as shown in
An external resistor as shown in
An external clock signal as shown in
DD
and V
Figure 1-3
Ceramic Resonator
OSC
OSC1
MC68HC705JJ7 • MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
(a) Crystal or
Connections
SS
, of the EPO or external clock source is divided by two to produce the internal
OP
2 MΩ
MCU
Pins
(a) shows a typical oscillator circuit for an AT-cut, parallel resonant crystal. The
.
OSC2
Figure 1-3
Figure 1-3. EPO Oscillator Connections
Chapter 17 Ordering
Figure 1-3
(a)
Figure 1-3
DD
(b) RC Oscillator
and V
Figure 1-3
OSC1
Connections
MCU
SS
R
(b)
(a)
. V
OSC2
DD
(c)
Information.
is the positive supply, and V
OSC1
Source Connection
(c) External Clock
EXTERNAL CLOCK
MCU
UNCONNECTED
OSC2
SS
VDD and VSS Pins
is ground. The
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