S912XHZ512F1VAG Datasheet, PDF (46/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 1 MC9S12XHZ Family Device Overview
1.2.4.3 V_DD1, V_SS1, V_SS2 — Internal Logic Power Pins
Power is supplied to the MCU through V_DD and V_SS. 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. This 2.5-V supply is derived from the
internal voltage regulator. There is no static load on those pins allowed.
V_SS1 and V_SS2 are internally connected.
1.2.4.4 V_DDA, V_SSA — Power Supply Pins for ATD and VREG
V_DDA, V_SSA are the power supply and ground pins for the voltage regulator and the analog-to-digital
converter.
1.2.4.5 V_RH, V_RL — ATD Reference Voltage Input Pins
V_RH and V_RL are the voltage reference pins for the analog-to-digital converter.
1.2.4.6 V_DDPLL, V_SSPLL — 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 2.5-V voltage is generated by
the internal voltage regulator.
1.2.4.7 V_DDM1, V_DDM2, V_DDM3 — Power Supply Pins for Motor 0 to 3
V_DDM1, V_DDM2 and V_DDM3 are the supply pins for the ports U, V and W. V_DDM1, V_DDM2 and V_DDM3
are internally connected.
1.2.4.8 V_SSM1, V_SSM2, V_SSM3 — Ground Pins for Motor 0 to 3
V_SSM1, V_SSM2 and V_SSM3 are the ground pins for the ports U, V and W. V_SSM1, V_SSM2 and V_SSM3 are
internally connected.
1.2.4.9 V_LCD — Power Supply Reference Pin for LCD driver
V_LCD is the voltage reference pin for the LCD driver. Adjusting the voltage on this pin will change the
display contrast.
MC9S12XHZ512 Data Sheet, Rev. 1.06
46
Freescale Semiconductor