S12SCIV2SLASHD datasheet(66/130 Pages) FREESCALE

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MC9S12H256 Device User Guide — V01.18

2.3.45 PV[3:0] / M2C1P, M2C1M, M2C0P, M2C0M — 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. These pins interface to the coils of motor 2. PWM output on

M2C0M results in a positive current flow through coil 0 when M2C0P is driven to a logic high state. PWM

output on M2C1M results in a positive current flow through coil 1 when M2C1P is driven to a logic high

state.

2.3.46 PW[7:4] / M5C1P, M5C1M, M5C0P, M5C0M — Port W I/O Pins [7:4]

PW7-PW4 are general purpose input or output pins. They can be configured as high current PWM output

pins which can be used for motor drive. These pins interface to the coils of motor 5. PWM output on

M5C0M results in a positive current flow through coil 0 when M5C0P is driven to a logic high state. PWM

output on M5C1M results in a positive current flow through coil 1 when M5C1P is driven to a logic high

state.

2.3.47 PW[3:0] / M4C1P, M4C1M, M4C0P, M4C0M — Port W I/O Pins [3:0]

PW3-PW0 are general purpose input or output pins. They can be configured as high current PWM output

pins which can be used for motor drive. These pins interface to the coils of motor 4. PWM output on

M4C0M results in a positive current flow through coil 0 when M4C0P is driven to a logic high state. PWM

output on M4C1M results in a positive current flow through coil 1 when M4C1P is driven to a logic high

state.

2.4 Power Supply Pins

MC9S12H256 power and ground pins are described below.

NOTE:

All VSS pins must be connected together in the application (21.2 Recommended

PCB layout).

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 21-1).

2.4.1 VDDR — External Power Pin

VDDR is the power supply pin for the internal voltage regulator.

2.4.2 VDDX1, VDDX2, VSSX1, VSSX2 — External Power and Ground Pins

VDDX1, VDDX2, VSSX1 and VSSX2 are the power supply and ground pins for input/output

drivers.VDDX1 and VDDX2 as well as VSSX1 and VSSX2 are not internally connected.

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