Chapter 1 Device Overview MC9S12ZVHY/MC9S12ZVHL Families
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
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Freescale Semiconductor
1.7.2.34.3
LPRXD0
This is the LIN physical layer receiver output signal.
1.7.2.34.4
LPDC0
This is the LIN LPDR1 register bit, visible at the designated pin for debug purposes.
1.7.3
VSENSE - Voltage Sensor Input
This pin can be connected to the supply (Battery) line for voltage measurements. The voltage present at
this input is scaled down by an internal voltage divider, and can be routed to the internal ADC via an analog
multiplexer. The pin itself is protected against reverse battery connections. To protect the pin from external
fast transients an external resistor is needed.
1.7.4
BCTL
BCTL provides the base current of an external bipolar of the VDDM, VDDA and VDDX supplies.
1.7.5
Power Supply Pins
The power and ground pins are described below. 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.
NOTE
All ground pins must be connected together in the application.
1.7.5.1
VDDX1, VDDX2, VDDX3, VSSX1, VSSX2, VSSX3 — Digital I/O Power and
Ground Pins
VDDX1 is a dedicated voltage regulator output for the digital I/O drivers. It must be connected externally
to the VDDX2 and VDDX3 pin, which supplies the VDDX domain pads. The VSSX1, VSSX2 and
VSSX3 pins are the ground pin for the digital I/O drivers. The VDDX1 and VDDX2 are internal connected
by metal, VDDX3 is not connect to VDDX1 or VDDX2 internally.
Bypass requirements on VDDX1/VSSX1, VDDX2/VSSX2 and VDDX3/VSSX3 depend on how heavily
the MCU pins are loaded.
1.7.5.2
VDDA, VSSA — External Power Supply Pins for ADC and VREG
These are the power supply and ground pins for the analog-to-digital converter and the voltage regulator.
1.7.5.3
VDDM1, VSSM1 — External Power Supply Pins for Motor PAD
These are the power supply and ground pins for the motor driver pads. It should be supply by external
power transistor.