PXD20RM Datasheet, PDF (89/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

3.3 Signal descriptions
The following sections provide signal descriptions and related information about the signals’ functionality
and configuration.
3.3.1 Pad configuration during reset phases
All pads have a fixed configuration under reset.
During the power-up phase, all pads are forced to tristate.
After power-up phase, all pads are floating with the following exceptions:
• PB[5] (FAB) is pull-down. Without external strong pull-up the device starts fetching from flash
memory.
• RESET pad is driven low. This is released only after PHASE2 reset completion.
• Fast (4-16 MHz) external oscillator pads (EXTAL, XTAL) are tristate.
• The following pads are pull-up:
— PB[6]
— PH[0]
— PH[1]
— PH[3]
3.3.2 Voltage supply pins
Voltage supply pins are used to provide power to the device. Two dedicated pins are used for 1.2 V
regulator stabilization.
Table 3-1. Voltage supply pin descriptions
Supply pin
Function
V_DD121
1.2 V core supply (1.08 V - 1.32 V)
176 LQFP
23, 50, 67, 110,
138, 175
Pin number
208 LQFP
416 TEPBGA
23, 58, 79, 136,
162, 186, 207
K10,K12,K14,K16,
L11,L13,L15,L17,M
10,M16,N11,N17,P
10,P16,R11,R17,T
10,T12,T14,T16,U1
1,U13,U15,U17
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
3-5
Preliminary—Subject to Change Without Notice