MC9S12HZ128VAL Datasheet, PDF (162/692 Pages) Freescale Semiconductor, Inc – MC9S12HZ256 Data Sheet, Rev. 2.05

Chapter 4 Port Integration Module (PIM9HZ256V2)
4.4.6 Polarity Select Register
The Polarity Select Register selects either a pull-up or pull-down device if enabled. The pull device
becomes active only if the pin is used as an input or as a wired-or output.
4.4.7 Pin Configuration Summary
The following table summarizes the effect of various configuration in the Data Direction (DDR),
Input/Output (I/O), reduced drive (RDR), Pull Enable (PE), Pull Select (PS) and Interrupt Enable (IE)
register bits. The PS configuration bit is used for two purposes:
1. Configure the sensitive interrupt edge (rising or falling), if interrupt is enabled.
2. Select either a pull-up or pull-down device if PE is set to “1”.
Table 4-40. Pin Configuration Summary
DDR
IO
RDR
PE
PS
IE¹
Function²
Pull Device
Interrupt
0
X
X
0
X
0
Input
Disabled
Disabled
0
X
X
1
0
0
Input
Pull Up
Disabled
0
X
X
1
1
0
Input
Pull Down
Disabled
0
X
X
0
0
1
Input
Disabled
Falling Edge
0
X
X
0
1
1
Input
Disabled
Rising Edge
0
X
X
1
0
1
Input
Pull Up
Falling Edge
0
X
X
1
1
1
Input
Pull Down
Rising Edge
1
0
0
X
X
0
Output to 0, Full Drive
Disabled
Disabled
1
1
0
X
X
0
Output to 1, Full Drive
Disabled
Disabled
1
0
1
X
X
0
Output to 0, Reduced Drive
Disabled
Disabled
1
1
1
X
X
0
Output to 1, Reduced Drive
Disabled
Disabled
1
0
0
X
0
1
Output to 0, Full Drive
Disabled
Falling Edge
1
1
0
X
1
1
Output to 1, Full Drive
Disabled
Rising Edge
1
0
1
X
0
1
Output to 0, Reduced Drive
Disabled
Falling Edge
1
1
1
X
1
1
Output to 1, Reduced Drive
Disabled
Rising Edge
1 _{Applicable only on Port AD.}
2 _{Digital outputs are disabled and digital input logic is forced to “1” when an analog module associated with the port is enabled.}
MC9S12HZ256 Data Sheet, Rev. 2.05
162
Freescale Semiconductor