MC9S12E Motorola, MC9S12E Datasheet - Page 89

• Manufacturer Part Number: MC9S12E
• Description: MC9S12E-Family Device User Guide V01.04
• Manufacturer: Motorola

Freescale Semiconductor, Inc.
Device User Guide — 9S12E128DGV1/D V01.04
impedance input pins. Consult the Port Integration Module (PIM) PIM_9E128 Block Guide, TIM_16B4C
Block Guide, and the PWM_8B6C Block Guide for information about pin configurations.
2.4 Power Supply Pins
2.4.1 VDDX,VSSX — Power & 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.
2.4.2 VDDR, VSSR — Power Supply Pins for I/O Drivers & for Internal Voltage
Regulator
External power and ground for I/O drivers and input to the internal voltage regulator. Bypass requirements
depend on how heavily the MCU pins are loaded.
2.4.3 VDD1, VDD2, VSS1, VSS2 — Power Supply Pins for Internal Logic
Power is supplied to the MCU through VDD and VSS. This 2.5V supply is derived from the internal
voltage regulator. There is no static load on those pins allowed. The internal voltage regulator is turned
off, if VDDR is tied to ground.
2.4.4 VDDA, VSSA — Power Supply Pins for ATD and VREG
VDDA, VSSA are the power supply and ground input pins for the voltage regulator and the analog to
digital converter.
2.4.5 VRH, VRL — ATD Reference Voltage Input Pins
VRH and VRL are the reference voltage input pins for the analog to digital converter.
2.4.6 VDDPLL, VSSPLL — Power Supply Pins for PLL
Provides operating voltage and ground for the Oscillator and the Phased-Locked Loop. This allows the
supply voltage to the Oscillator and PLL to be bypassed independently.This 2.5V voltage is generated by
the internal voltage regulator.
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