MC68HC908GP32CP Freescale Semiconductor, MC68HC908GP32CP Datasheet - Page 111

• Manufacturer Part Number: MC68HC908GP32CP
• Description: IC MCU 8MHZ 32K FLASH 40-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP32CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• For Use With: M68EVB908GP32 - BOARD EVALUATION FOR HC908GP32
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

7.4.1 Crystal Oscillator Circuit
7.4.2 Phase-Locked Loop Circuit (PLL)
7.4.3 PLL Circuits
MC68HC908GP32
MOTOROLA
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MC68HC08GP32
The crystal oscillator circuit consists of an inverting amplifier and an
external crystal. The OSC1 pin is the input to the amplifier and the OSC2
pin is the output. The SIMOSCEN signal from the system integration
module (SIM) or the OSCSTOPENB bit in the CONFIG register enable
the crystal oscillator circuit.
The CGMXCLK signal is the output of the crystal oscillator circuit and
runs at a rate equal to the crystal frequency. CGMXCLK is then buffered
to produce CGMRCLK, the PLL reference clock.
CGMXCLK can be used by other modules which require precise timing
for operation. The duty cycle of CGMXCLK is not guaranteed to be 50%
and depends on external factors, including the crystal and related
external components. An externally generated clock also can feed the
OSC1 pin of the crystal oscillator circuit. Connect the external clock to
the OSC1 pin and let the OSC2 pin float.
The PLL is a frequency generator that can operate in either acquisition
mode or tracking mode, depending on the accuracy of the output
frequency. The PLL can change between acquisition and tracking
modes either automatically or manually.
The PLL consists of these circuits:
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Voltage-controlled oscillator (VCO)
Reference divider
Frequency prescaler
Modulo VCO frequency divider
Phase detector
Loop filter
Lock detector
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Rev. 6
Clock Generator Module (CGMC)
Clock Generator Module (CGMC)
Functional Description
Technical Data
109