Freescale Semiconductor 56F8122 - Manual (Page 17)

Signal Pins
56F8322 Technical Data, Rev. 10.0
Freescale Semiconductor 17
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
V
DD_IO
5 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.
V
DD_IO
14
V
DD_IO
34
V
DD_IO
44
V
DDA_ADC
30 Supply ADC Power — This pin supplies 3.3V power to the ADC modules. It
must be connected to a clean analog power supply.
V
SS
10 Supply Ground — These pins provide ground for chip logic and I/O drivers.
V
SS
13
V
SS
31
V
SS
45
V
SSA_ADC
29 Supply ADC Analog Ground — This pin supplies an analog ground to the
ADC modules.
V
CAP
1 43 Supply Supply V
CAP
1 - 2 — Connect each pin to a 2.2
µ
F or greater bypass capacitor
in order to bypass the core logic voltage regulator, required for proper
chip operation.
V
CAP
2 17