Motorola ColdFire MCF5281 - Manual (Page 272)

Signal Descriptions
14-32 Freescale Semiconductor
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.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3