MC9S12C Datasheet, PDF (670/680 Pages) Motorola, Inc – 16-Bit Microcontroller

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.
Pin Name
Function 1
PK[2:0]
Pin Name
Function 2
XADDR[16:14]
Power Domain
V_DDX
Internal Pull
Resistor
CTRL
PUPKE
Reset
State
Up
Description
Port K I/O Pins
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.
670
MC9S12C-Family / MC9S12GC-Family
Freescale Semiconductor
Rev 01.23