MC3S12RG128 Datasheet, PDF (106/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2 Port Integration Module (PIM3RG128V1) Block Description
2.3.2.7.6 Port J Polarity Select Register (PPSJ)
Module Base + 0x_002D
R
W
Reset
7
PPSJ7
0
6
5
4
3
2
0
0
0
0
PPSJ6
0
—
—
—
—
= Unimplemented or Reserved
Figure 2-45. Port J Polarity Select Register (PPSJ)
1
PPSJ1
0
0
PPSJ0
0
Read: Anytime.
Write: Anytime.
This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting
a pull-up or pull-down device if enabled.
Table 2-39. PPSJ Field Descriptions
Field
Description
7, 6, 1, 0
PPSJ[7:6]
PPSJ]1:0]
Polarity Select Port J Bits
0 Falling edge on the associated port J pin sets the associated flag bit in the PIFJ register. A pull-up device is
connected to the associated port J pin, if enabled by the associated bit in register PERJ and if the port is used
as general purpose input or as IIC port.
1 Rising edge on the associated port J pin sets the associated flag bit in the PIFJ register. A pull-down device
is connected to the associated port J pin, if enabled by the associated bit in register PERJ and if the port is
used as input.
MC3S12RG128 Data Sheet, Rev. 1.05
106
Freescale Semiconductor