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Device Overview MC9S12G-Family
1.7.2.25
IRQ
This signal is associated with the maskable IRQ interrupt.
1.7.2.26
XIRQ
This signal is associated with the non-maskable XIRQ interrupt.
1.7.2.27
ETRIG[3:0]
These signals are inputs to the Analog-to-Digital Converter. Their purpose is to trigger ADC conversions.
1.7.3
Power Supply Pins
MC9S12G power and ground pins are described below. Because fast signal transitions place high,
short-duration current demands on the power supply, use bypass capacitors with high-frequency
characteristics and place them as close to the MCU as possible.
NOTE
All ground pins must be connected together in the application.
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.
MC9S12G Family Reference Manual, Rev.1.23
60
Freescale Semiconductor
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