Device Overview MC9S12P-Family
1.7.3.30
PT4 / IOC4 / PWM4 — Port T I/O Pin 4
PT4 is a general-purpose input or output pin. It can be configured as timer (TIM) channel 4 or pulse width
modulator (PWM) output 4.
1.7.3.31
PT[3:1] / IOC[3:1] — Port T I/O Pin [3:1]
PT[3:1] are a general-purpose input or output pins. They can be configured as timer (TIM) channels 3-1.
1.7.3.32
PT0 / IOC0 / PWM0 — Port T I/O Pin 0
PT0 is a general-purpose input or output pin. It can be configured as timer (TIM) channel 0 or pulse width
modulator (PWM) output 0.
1.7.4
Power Supply Pins
MC9S12P-Family 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 V
SS
pins must be connected together in the application.
1.7.4.1
VDDX[2:1], VSSX[2:1] — Power and Ground Pins for I/O Drivers
External power and ground for I/O drivers. Bypass requirements depend on how heavily the MCU pins are
loaded. All VDDX pins are connected together internally. All VSSX pins are connected together
internally.
1.7.4.2
VDDR — Power Pin for Internal Voltage Regulator
Power supply input to the internal voltage regulator.
1.7.4.3
VSS3 — Core Ground Pin
The voltage supply of nominally 1.8V is derived from the internal voltage regulator. The return current
path is through the VSS3 pin. No static external loading of these pins is permitted.
1.7.4.4
VDDA, VSSA — Power Supply Pins for ATD and Voltage Regulator
These are the power supply and ground input pins for the analog-to-digital converter and the voltage
regulator.
1.7.4.5
VRH, VRL — ATD Reference Voltage Input Pins
VRH and VRL are the reference voltage input pins for the analog-to-digital converter.
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
41
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
