PXD20 Datasheet, PDF (29/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Pinout and signal descriptions
1 _{Decoupling capacitors must be connected between these pins and the nearest VSS pin.}
2 _{VDDA must be at the same voltage as VDDE_A.}
3 _{This signal needs to be connected to ground during normal operation.}
2.4.3 Pad types
The pads available for system pins and functional port pins are described in:
• The port pin summary in Table 1;
• The pad type descriptions in Table 3-6;
• Section 43.5.3.8, “Pad Configuration Registers (PCR0–PCR184) and Section 43.5.3.9, “Pad Configuration Registers
(PCR185–PCR281);
• The device data sheet.
2.4.4 System pins
The system pins are listed in Table 4.
Table 4. System pin descriptions
System pin
Function
I/O
Pad
RESET
Pin number
direction type configuration¹ _{176 LQFP 208 LQFP 416 TEPBGA}
RESET
Bidirectional reset with
Schmitt-Trigger
characteristics and noise
filter.
I/O
M Input, weak pull
30
up
EXTAL Analog input to the oscillator
I
X
—
27
amplifier circuit. Input for the
clock generator in bypass
mode.
XTAL Analog output of the
O
X
—
28
oscillator amplifier circuit.
Needs to be grounded if
oscillator bypass mode is
used.
EXTAL32 Analog input of the 32KHz
O
S
—
70
oscillator amplifier circuit.
XTAL32 Analog output of the 32 KHz
I
S
—
69
oscillator amplifier circuit.
Input for the clock generator
in bypass mode.
NMI Non-Maskable Interrupt
I/O
S
Input, none
45
VRC_CTRL Voltage Regulator external
NPN Ballast base control
pin
Analo
—
29
g
VREF_ RSDS interface reference
RSDS² voltage
Analo
—
—
g
VREG_ Pin used for factory testing
I
—
—
26
BYPASS³
30
W1
27
AB1
28
AA1
86
AF24
85
AF23
53
AC7
29
AA3
145, 165
26
J24,D24
AA2
PXD20 Microcontroller Data Sheet, Rev. 2
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
29