Specifications

The Pace-Setting Performance and Features of the 56F8300 Hybrid Controllers
MOTOROLA Motorola 56F8300 Hybrid Controller Family 17
• Low-voltage detectors generate high-priority interrupts
— Two low-voltage detect signals are used to initiate a software-controlled shutdown when
the supply voltage drops below acceptable levels (either 2.2V or 2.7V)
• Reduced system cost
— Eliminates need for external power monitor
3.2.3 On-Chip Relaxation Oscillator and On-chip Clock Synthesis (OCCS)
The OCCS enables the use of a wide variety of clocking sources and operating frequencies. Some of
the features and benefits of the OCCS peripheral are:
• Several dynamically selectable system clock sources available
— Internal 8MHz relaxation oscillator (on some chips)
— External 8MHz ceramic resonator
— External 8MHz crystal
— External clock source
• Dynamically programmable Phase Locked Loop (PLL) enables operating frequency up to
60MHz
— Configurable power/speed options
• Generates an interrupt if either loss of clock, or loss of lock, or both, occur
— Improves system safety and reliability
• Internal oscillator drive circuitry enables use of crystal or ceramic resonator
— Lower system cost by eliminating active external components
— Lower system cost using low-cost ceramic resonator
The features of the OCCS offer superior system cost savings while providing greater flexibility in
selecting the operating frequency that provides the proper performance while utilizing the least amount
of power. The loss of lock and loss of clock detection provide greater safety and reliability by ensuring
that the proper operating frequency is present. Even if the external clock source is entirely lost, the
PLL continues to operate for a specified number of clock cycles, enabling safe system shutdown.
The 56F8322 and 56F8323 devices are equipped with an internal 8MHz relaxation oscillator that can
be used with the clock source.
The internal relaxation oscillator has high accuracy because it is factory
trimmed to 0.25% of 8MHz at room temperature. Over the full operating temperature range, this
variation will stay within 2% of 8MHz. By using the internal temperature sensor and profile of
frequency-to-temperature provided in the data sheet, the trim values can be adjusted for temperature
variations and a frequency accuracy better than 2% can be maintained. The internal relaxation
oscillator provides system cost savings by eliminating the need for external components entirely. The
internal relaxation oscillator lowers system part count, system cost, and improves system reliability.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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