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MCF5282 External Signals
14.2.16 Power and Reference Signals
These signals provide system power, ground and references to the device. Multiple pins are
provided for adequate current capability. All power supply pins must have adequate bypass
capacitance for high-frequency noise suppression.
14.2.16.1 QADC Analog Reference (VRH, VRL)
These signals serve as the high (VRH) and low (VRL) reference potentials for the analog
converter in the QADC.
14.2.16.2 QADC Analog Supply (VDDA, VSSA)
These are dedicated power supply signals to isolate the sensitive QADC analog circuitry
from the normal levels of noise present on the digital power supply.
14.2.16.3 PLL Analog Supply (VDDPLL, VSSPLL)
These are dedicated power supply signals to isolate the sensitive PLL analog circuitry from
the normal levels of noise present on the digital power supply.
14.2.16.4 QADC Positive Supply (VDDH)
This pin supplies positive power to the ESD structures in the QADC pads.
14.2.16.5 Power for Flash Erase/Program (VPP)
This pin is used for Flash stress testing and can be left unconnected in normal device
operation.
14.2.16.6 Power and Ground for Flash Array (VDDF, VSSF)
These signals supply a power and ground to the Flash array.
14.2.16.7 Standby Power (VSTBY)
This pin is used to provide standby voltage to the RAM array if VDD is lost.
14.2.16.8 Positive Supply (VDD)
This pin supplies positive power to the core logic and I/O pads.
14.2.16.9 Ground (VSS)
This pin is the negative supply (ground) to the chip.
MOTOROLA
Chapter 14. Signal Descriptions
14-33
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