S912XEG128J2MAA Datasheet, PDF (73/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1 Device Overview MC9S12XE-Family
1.2.4.4 VDDF — NVM Power Pin
Power is supplied to the MCU NVM through VDDF . The voltage supply of nominally 2.8V is derived
from the internal voltage regulator. No static external loading of these pins is permitted.
1.2.4.5 VDDA2, VDDA1, VSSA2_, VSSA1 — Power Supply Pins for ATD and
Voltage Regulator
These are the power supply and ground input pins for the analog-to-digital converters and the voltage
regulator. Internally the V_DDA pins are connected together. Internally the V_SSA pins are connected
together.
1.2.4.6 VRH, VRL — ATD Reference Voltage Input Pins
V_RH and V_RL are the reference voltage input pins for the analog-to-digital converter.
1.2.4.7 VDDPLL, VSSPL — Power Supply Pins for PLL
These pins provide operating voltage and ground for the oscillator and the phased-locked loop. The voltage
supply of nominally 1.8V is derived from the internal voltage regulator. This allows the supply voltage to
the oscillator and PLL to be bypassed independently. This voltage is generated by the internal voltage
regulator. No static external loading of these pins is permitted.
Table 1-11. Power and Ground Connection Summary
Mnemonic
VDDR
VDDX[7:1]
VSSX[7:1]
VDDA2_,
VDDA1
VSSA2_,
VSSA1
VRL
VRH
VDD
VSS1, VSS2,
VSS3
VDDF
Nominal
Voltage
5.0 V
5.0 V
0V
5.0 V
0V
0V
5.0 V
1.8 V
0V
2.8 V
Description
External power supply to internal voltage
regulator
External power and ground, supply to pin
drivers
Operating voltage and ground for the
analog-to-digital converters and the
reference for the internal voltage regulator,
allows the supply voltage to the A/D to be
bypassed independently.
Reference voltages for the analog-to-digital
converter.
Internal power and ground generated by
internal regulator for the internal core.
Internal power and ground generated by
internal regulator for the internal NVM.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
73