Datasheet

Signal Pins
56F8346 Technical Data, Rev. 15
Freescale Semiconductor 21
Preliminary
OCR_DIS 79 Input Input On-Chip Regulator Disable —
Tie this pin to V
SS
to enable the on-chip regulator
Tie this pin to V
DD
to disable the on-chip regulator
This pin is intended to be a static DC signal from power-up to
shut down. Do not try to toggle this pin for power savings
during operation.
V
CAP
1 51 Supply Supply V
CAP
1 - 4 — When OCR_DIS is tied to V
SS
(regulator enabled),
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. When OCR_DIS is tied to V
DD
(regulator disabled),
these pins become V
DD_CORE
and should be connected to a
regulated 2.5V power supply.
Note: This bypass is required even if the chip is powered with
an external supply.
V
CAP
2 128
V
CAP
3 83
V
CAP
4 15
V
PP
1 125 Input Input V
PP
1 - 2 — These pins should be left unconnected as an open
circuit for normal functionality.
V
PP
2 2
CLKMODE 87 Input Input Clock Input Mode Selection — This input determines the function
of the XTAL and EXTAL pins.
1 = External clock input on XTAL is used to directly drive the input
clock of the chip. The EXTAL pin should be grounded.
0 = A crystal or ceramic resonator should be connected between
XTAL and EXTAL.
EXTAL 82 Input Input External Crystal Oscillator Input — This input can be connected
to an 8MHz external crystal. Tie this pin low if XTAL is driven by an
external clock source.
XTAL 81 Input/
Output
Chip-driven Crystal Oscillator Output — This output connects the internal
crystal oscillator output to an external crystal.
If an external clock is used, XTAL must be used as the input and
EXTAL connected to GND.
The input clock can be selected to provide the clock directly to the
core. This input clock can also be selected as the input clock for
the on-chip PLL.
Table 2-2 Signal and Package Information for the 144 Pin LQFP
Signal Name Pin No. Type
State
During
Reset
Signal Description