MCF548x External Signals
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor 2-31

2.2.17 Power and Reference Pins

These pins 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.
2.2.17.1 Positive Pad Supply (EVDD)
This pin supplies positive power to the I/O pads.
2.2.17.2 Positive Core Supply (IVDD)
This pin supplies positive power to the core logic.
2.2.17.3 Ground (VSS)
This pin is the negative supply (ground) to the chip.
2.2.17.4 USB Power (USBVDD)
This pin supplies positive power to the USB module’s digital logic.
2.2.17.5 USB Oscillator Power (USB_OSCVDD)
This pin supplies positive power to the USB oscillator’s digital logic.
2.2.17.6 USB PHY Power (USB_PHYVDD)
This pin supplies positive power to the USB PHY’s digital logic.
2.2.17.7 USB Oscillator Analog Power (USB_OSCAVDD)
This pin supplies positive power to the USB oscillator’s analog circuits.
2.2.17.8 USB PLL Analog Power (USB_PLLVDD)
This pin supplies positive power to the USB PLL’s circuits.
2.2.17.9 SDRAM Memory Supply (SDVDD)
This pin supplies positive power to the SDRAM module.
2.2.17.10 PLL Analog Power (PLLVDD)
This pin supplies the positive power for the PLL.
2.2.17.11 PLL Analog Ground (PLLVSS)
This pin is the negative supply (ground) to the PLL.