MAC7200 datasheet(133/976 Pages) FREESCALE

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Power Supply Pins

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

4.4.5

VDD15a, VSS15a — Core Power Pins

These pins provide the operating voltage and ground for the MCU core logic. Because fast signal

transitions place high, short-duration current demands on the power supply, use bypass capacitors with

high-frequency characteristics and place them as close to the MCU as possible. This 1.5V supply is derived

from the internal voltage regulator when the voltage regulator is enabled. Otherwise, it must be supplied

externally. There is no static load on these pins allowed. The internal voltage regulator is turned off, if

VREGEN is tied to ground. If the VDD15a pin is grounded or left open, the device will be completely

non-functional.

NOTE

No load allowed except for bypass capacitors.

4.4.6

VDD15c/VDDF, VSS15c/VSSF — Core and Flash Logic Power Pins

These pins provide the operating voltage and ground for the MCU and Flash core logic. Because fast signal

transitions place high, short-duration current demands on the power supply, use bypass capacitors with

high-frequency characteristics and place them as close to the MCU as possible. This 1.5V supply is derived

from the internal voltage regulator when the voltage regulator is enabled. Otherwise, it must be supplied

externally. There is no static load on these pins allowed. The internal voltage regulator is turned off, if

VREGEN is tied to ground. If the VDD15c pin is grounded or left open, the MCU will be completely

non-functional.

NOTE

No load allowed except for bypass capacitors.

4.4.7

VDD33/VFLASH, VSS33 — Flash and I/O Pre-Driver Power Pins

These pins provide the operating voltage and ground for the Flash and I/O pre-drivers. Because fast signal

transitions place high, short-duration current demands on the power supply, use bypass capacitors with

high-frequency characteristics and place them as close to the MCU as possible. This 3.3V supply is derived

from the internal voltage regulator when the voltage regulator is enabled. Otherwise, it must be supplied

externally. There is no static load on these pins allowed. The internal voltage regulator is turned off, if

VREGEN is tied to ground. If the VDD33 pin is grounded or left open, the Flash and all I/O outputs will

be completely non-functional.

NOTE

No load allowed except for bypass capacitors.

4.4.8

VDDA, VSSA — Power Supply Pins for ATD and Voltage Regulator

Control

These pins provide the operating voltage and ground for the ATD and the Voltage Regulator control block.

This allows the supply voltage to the ATD to be bypassed independently of the main I/O supply VDDx

and VSSx. If the VDDA pin is grounded or left open, the ATD will be completely non-functional. If the

VDDA pin is grounded or left open, and the internal regulator is not bypassed, then the complete MCU

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