Motorola MC9S12GC-Family, MC9S12C-Family warranty 1 PK20 / XADDR1614

Models: MC9S12C-Family MC9S12GC-Family

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Device User Guide — 9S12C128DGV1/D V01.05

E.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

 

Pin Name

Pin Name

Power

Resistor

Description

Function 1

Function 2

Domain

CTRL

Reset

 

 

 

 

State

 

 

 

 

 

 

 

 

 

 

 

 

PK[2:0]

XADDR[16:14]

VDDX

PUPKE

Up

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 unneccesary current consumption at the input stage.

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Page 132
Image 132
Motorola MC9S12GC-Family, MC9S12C-Family warranty 1 PK20 / XADDR1614