Device Overview MC9S12G-Family
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 51
1.7.3.1 VDDX[3:1]/VDDX, VSSX[3:1]/VSSX— Power and Ground Pins for I/O
Drivers
External power and ground for I/O drivers. Bypass requirements depend on how heavily the MCU pins are
loaded. All VDDX pins are connected together internally. All VSSX pins are connected together
internally.
NOTE
Not all VDDX[3:1]/VDDX and VSSX[3:1]VSSX pins are available on all
packages. Refer to section 1.8 Device Pinouts for further details.
1.7.3.2 VDDR — Power Pin for Internal Voltage Regulator
Power supply input to the internal voltage regulator.
NOTE
On some packages VDDR is bonded to VDDX and the pin is named
VDDXR. Refer to section 1.8 Device Pinouts for further details.
1.7.3.3 VSS — Core Ground Pin
The voltage supply of nominally 1.8V is derived from the internal voltage regulator. The return current
path is through the VSS pin.
1.7.3.4 VDDA, VSSA — Power Supply Pins for DAC,ACMP, RVA, ADC and
Voltage Regulator
These are the power supply and ground input pins for the digital-to-analog converter, the analog
comparator, the reference voltage attenuator, the analog-to-digital converter and the voltage regulator.
NOTE
On some packages VDDA is connected with VDDXR and the common pin
is named VDDXRA.
On some packages the VSSA is connected to VSSX and the common pin is
named VSSXA. See section Section 1.8, “Device Pinouts” for further
details.
1.7.3.5 VRH — Reference Voltage Input Pin
V
RH
is the reference voltage input pin for the digital-to-analog converter and the analog-to-digital
converter. Refer to Section 1.18, “ADC VRH/VRL Signal Connection” for further details.
On some packages VRH is tied to VDDA or VDDXRA. Refer to section 1.8
Device Pinouts for further details.
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