MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 55

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1.3.4.27
PS3 and PS2 are general purpose input or output pins. These pins are not available in the 48- / 52-pin
package versions.
1.3.4.28
PS1 is a general purpose input or output pin and the transmit pin, TXD, of serial communication interface
(SCI).
1.3.4.29
PS0 is a general purpose input or output pin and the receive pin, RXD, of serial communication interface
(SCI).
1.3.4.30
PT7–PT5 are general purpose input or output pins. They can also be configured as the timer system input
capture or output compare pins IOC7-IOC5.
1.3.4.31
PT4–PT0 are general purpose input or output pins. They can also be configured as the timer system input
capture or output compare pins IOC[n] or as the PWM outputs PW[n].
1.3.5
1.3.5.1
External power and ground for I/O drivers. Bypass requirements depend on how heavily the MCU pins are
loaded.
1.3.5.2
External power and ground for the internal voltage regulator. Connecting V
internal voltage regulator.
1.3.5.3
Power is supplied to the MCU through V
regulator. There is no static load on those pins allowed. The internal voltage regulator is turned off, if V
is tied to ground.
Freescale Semiconductor
Power Supply Pins
PS[3:2] — Port S I/O Pins [3:2]
PS1 / TXD — Port S I/O Pin 1
PS0 / RXD — Port S I/O Pin 0
PT[7:5] / IOC[7:5] — Port T I/O Pins [7:5]
PT[4:0] / IOC[4:
V
V
Voltage Regulator
V
DDX
DDR
DD1
, V
,V
, V
SSX
DD2
SSR
, V
— Power and Ground Pins for I/O Drivers
— Power and Ground Pins for I/O Drivers and for Internal
SS1
2
] / PW[
, V
SS2
DD
— Internal Logic Power Pins
3
and V
:0]— Port T I/O Pins [4:0]
MC9S12Q128
Rev 1.09
SS
. This 2.5V supply is derived from the internal voltage
Chapter 1 MC9S12Q Device Overview (MC9S12Q128-Family)
DDR
to ground disables the
DDR
55