mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 955

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

PERJ[7:4]
PERJ[2:0]
PPSJ[7:4]
PPSJ[2:0]
Reset
Reset
This register configures whether a pull-up or a pull-down device is activated, if the port is used as
input or as wired-OR output. This bit has no effect if the port is used as push-pull output. Out of
reset a pull-up device is enabled.
Field
23.0.5.59 Port J Polarity Select Register (PPSJ)
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.
Field
23.0.5.60 Port J Interrupt Enable Register (PIEJ)
7–0
7–0
W
W
R
R
PPSJ7
PIEJ7
Pull Device Enable Port J
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
Polarity Select Port J
0 Falling edge on the associated port J pin sets the associated flag bit in the PIFJ register.
1 Rising edge on the associated port J pin sets the associated flag bit in the PIFJ register.
7
0
7
0
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.
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.
= Unimplemented or Reserved
= Unimplemented or Reserved
PPSJ6
PIEJ6
0
0
6
6
Figure 23-62. Port J Interrupt Enable Register (PIEJ)
Figure 23-61. Port J Polarity Select Register (PPSJ)
Table 23-54. PERJ Field Descriptions
Table 23-55. PPSJ Field Descriptions
PPSJ5
PIEJ5
5
0
5
0
PPSJ4
PIEJ4
0
0
4
4
Description
Description
3
0
0
3
0
0
PPSJ2
PIEJ2
0
0
2
2
PPSJ1
PIEJ1
1
0
1
0
PPSJ0
PIEJ0
0
0
0
0