PXD20RM Datasheet, PDF (91/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Table 3-1. Voltage supply pin descriptions (continued)
Supply pin
Function
176 LQFP
Pin number
208 LQFP
V_{DD33_DR} Functional supply for SDRAM pads (where
—
—
available must be >= VDD_DR)
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.}
416 TEPBGA
D6, D12, F4, R4
3.3.3 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.
3.3.4 System pins
The system pins are listed in Table 3-2.
Table 3-2. System pin descriptions
System pin
Function
I/O
direction
Pad
type
RESET
configuration¹
176 LQFP
Pin number
208 LQFP 416 TEPBGA
RESET Bidirectional reset with
I/O
M Input, weak pull
30
30
Schmitt-Trigger
up
characteristics and noise
filter.
EXTAL Analog input to the
I
X
—
oscillator amplifier circuit.
Input for the clock generator
in bypass mode.
27
27
XTAL Analog output of the
O
X
—
oscillator amplifier circuit.
Needs to be grounded if
oscillator bypass mode is
used.
28
28
EXTAL32 Analog input of the 32KHz
O
S
—
oscillator amplifier circuit.
70
86
W1
AB1
AA1
AF24
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
3-7
Preliminary—Subject to Change Without Notice