MAC7200 datasheet(132/976 Pages) FREESCALE

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Power Supply Pins

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

4.3.74

PG[15] / PCS[3] — Port G I/O Pin and DSPI_B

PG[15] is a configurable general purpose input or output pin. It can be configured to provide either high

or reduced output drives, to enable or disable either a pull-up or pull-down resistors on the pin or to provide

either an open drain or push-pull pad. The pins can be configured as a chip select pin PCS[3] when in

Master mode for the Serial Peripheral Interface B (DSPI_B). It can be configured to wake the system out

of low-power mode (DOZE) when an external signal is applied using the interrupt functionality.

4.4

Power Supply Pins

MAC72xx power and ground pins are described below.

NOTE

All VSS pins must be connected together in the application.

4.4.1

VPP — Power For Flash Program and Erase

VPP is the power supply and ground input pins for the program and erase circuitry inside the Flash. If this

pin is grounded or left open, programming and erasing of the Flash will be unavailable, and the system

will have unpredictable behavior in the case where Flash programming or erasing is attempted.

4.4.2

VDDX1-4,6-11, VSSX1-11 (except VDDX5) — Power and Ground Pins

for I/O Drivers

External power and ground for I/O 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. Bypass requirements depend on how heavily the MCU pins are

loaded. If one or more of these pins are left open, the ability of the I/O to drive loads could be

compromised, resulting in slower transition times on outputs.

4.4.3

VDDX5 /VDDAPASS — Power Pin for I/O Drivers and Control Voltage

for Internal Pass Transistors

External power for I/O drivers and control voltage for internal pass transistors. 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. Bypass requirements

depend on how heavily the MCU pins are loaded. If this pin is left open, the internal voltage regulator may

not be able to control the internal pass transistors, resulting in a completely non-functional device.

4.4.4

VDDR/VREGEN — Power Pin for the Internal Voltage Regulator

This 5.0V supply pin supplies all current for the 1.5V and 3.3V on-chip regulated supplies. This pin will

supply most of the current consumed by the device, except for the I/O, which is supplied by the

VDDx/VSSx pad pairs. If this pin is grounded, the internal voltage regulation is disabled, and all 1.5V and

3.3V supplies must be supplied from external sources through the VDD15x/VSS15x, VDD33/VSS33a and

VDDPLL/VSSPLL pin pairs.

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