56F8322 datasheet(19/136 Pages) FREESCALE

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Signal Pins

56F8322 Technical Data, Rev. 16

Freescale Semiconductor

Preliminary

2.2 Signal Pins

After reset, each pin is configured for its primary function (listed first). In the 56F8122, after reset, each

pin must be configured for the desired function. The initialization software will configure each pin for the

function listed first for each pin, as shown in Table 2-2. Any alternate functionality must be programmed.

Note: Signals in italics are not available in the 56F8122 device.

If the “State During Reset” lists more than one state for a pin, the first state is the actual reset state. Other

states show the reset condition of the alternate function, which you get if the alternate pin function is

selected without changing the configuration of the alternate peripheral. For example, the SCLK0/GPIOB3

pin shows that it is tri-stated during reset. If the GPIOB_PER is changed to select the GPIO function of

the pin, it will become an input if no other registers are changed.

Table 2-2 Signal and Package Information for the 48-Pin LQFP

Signal Name

Pin No.

Type

State During

Reset

Signal Description

VDD_IO

Supply

I/O Power — This pin supplies 3.3V power to the chip I/O interface

and also the Processor core throught the on-chip voltage regulator, if

it is enabled.

VDD_IO

VDDA_ADC

Supply

ADC Power — This pin supplies 3.3V power to the ADC modules. It

must be connected to a clean analog power supply.

VSS

Supply

Ground — These pins provide ground for chip logic and I/O drivers.

VSS

VSSA_ADC

Supply

ADC Analog Ground — This pin supplies an analog ground to the

ADC modules.

VCAP1

Supply

VCAP1 - 2 — Connect each pin to a 2.2μF or greater bypass capacitor

in order to bypass the core logic voltage regulator, required for proper

chip operation.

VCAP2

56F8322 Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc

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