S12SCIV2SLASHD datasheet(67/130 Pages) FREESCALE

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MC9S12H256 Device User Guide — V01.18

2.4.3 VDD1, VSS1, VSS2 — Core Power Pins

VDD1, VSS1 and VSS2 are the core power and ground pins and related to the voltage regulator output.

These pins serve as connection points for filter capacitors. VSS1 and VSS2 are internally connected.

NOTE:

No load allowed except for bypass capacitors.

2.4.4 VDDA, VSSA — Power Supply Pins for ATD and VREG

VDDA, VSSA are the power supply and ground pins for the voltage regulator and the analog to digital

converter.

2.4.5 VDDM1, VDDM2, VDDM3 — Power Supply Pins for Motor 0 to 5

VDDM1, VDDM2 and VDDM3 are the supply pins for the ports U,V and W. VDDM1, VDDM2 and

VDDM3 are internally connected.

2.4.6 VSSM1, VSSM2, VSSM3 — Ground Pins for Motor 0 to 5

VSSM1, VSSM2 and VSSM3 are the ground pins for the ports U,V and W. VSSM1, VSSM2 and VSSM3

are internally connected.

2.4.7 VLCD — Power Supply Reference Pin for LCD driver

VLCD is the voltage reference pin for the LCD driver. Adjusting the voltage on this pin will change the

display contrast.

2.4.8 VRH, VRL — ATD Reference Voltage Input Pins

VRH and VRL are the voltage reference pins for the analog to digital converter.

2.4.9 VDDPLL, VSSPLL — Power Supply Pins for PLL

VDDPLL and VSSPLL are the PLL supply pins and serve as connection points for external loop filter

components.

NOTE:

No load allowed except for bypass capacitors.

Freescale Semiconductor, Inc.

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S12SCIV2/D Datasheet(PDF) 67 Page - Freescale Semiconductor, Inc