MC9S12HZ128VAL Datasheet, PDF (44/692 Pages) Freescale Semiconductor, Inc – MC9S12HZ256 Data Sheet, Rev. 2.05

Chapter 1 MC9S12HZ256 Device Overview
1.5.6.36 PV[7:4] / M3C1(SIN)P, M3C1(SIN)M, M3C0(COS)P, M3C0(COS)M — Port V
I/O Pins [7:4]
PV7–PV4 are general-purpose input or output pins. They can be configured as high current PWM output
pins which can be used for motor drive or to measure the back EMF to calibrate the pointer reset position.
These pins interface to the coils of motor 3.
1.5.6.37 PV[3:0] / M2C1(SIN)P, M2C1(SIN)M, M2C0(COS)P, M2C0(COS)M — Port V
I/O Pins [3:0]
PV3–PV0 are general-purpose input or output pins. They can be configured as high current PWM output
pins which can be used for motor drive or to measure the back EMF to calibrate the pointer reset position.
These pins interface to the coils of motor 2.
1.5.7 Power Supply Pins
MC9S12HZ256 power and ground pins are described below.
NOTE
All V_SS pins must be connected together in the application (See
Appendix B, “PCB Layout Guidelines”).
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. Bypass
requirements depend on how heavily the MCU pins are loaded (Table B-1).
1.5.7.1 V_DDR — External Power Pin
V_DDR is the power supply pin for the internal voltage regulator.
1.5.7.2 V_DDX1, V_DDX2, V_SSX1, V_SSX2 — External Power and Ground Pins
V_DDX1, V_DDX2, V_SSX1 and V_SSX2 are the power supply and ground pins for input/output drivers.V_DDX1
and V_DDX2 as well as V_SSX1 and V_SSX2 are not internally connected.
1.5.7.3 V_DD1, V_SS1, V_SS2 — Internal Logic Power Pins
V_DD1, V_SS1 and V_SS2 are the internal logic power and ground pins and related to the voltage regulator
output. These pins serve as connection points for filter capacitors. V_SS1 and V_SS2 are internally connected.
NOTE
No load allowed except for bypass capacitors.
1.5.7.4 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.
MC9S12HZ256 Data Sheet, Rev. 2.05
44
Freescale Semiconductor