MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 632

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

Appendix B Emulation Information
B.1.1
PK[2:0] / XADDR[16:14]
PK2-PK0 provide the expanded address XADDR[16:14] for the external bus.
Refer to the S12 Core user guide for detailed information about external address page access.
Internal Pull
Resistor
Pin Name
Pin Name
Power Domain
Description
Function 1
Function 2
Reset
CTRL
State
PK[2:0]
XADDR[16:14]
V
PUPKE
Up
Port K I/O Pins
DDX
The reset state of DDRK in the S12_CORE is $00, configuring the pins as inputs.
The reset state of PUPKE in the PUCR register of the S12_CORE is "1" enabling the internal pullup
resistors at PortK[2:0].
In this reset state the pull-up resistors provide a defined state and prevent a floating input, thereby
preventing unnecessary current consumption at the input stage.
632
MC9S12Q128
Freescale Semiconductor
Rev 1.09