mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1023

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

PERJ[7:6]
PERJ[1:0]
PPSJ[7:6]
PPSJ[1:0]
Reset
Reset
Field
24.0.5.55 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
24.0.5.56 Port J Interrupt Enable Register (PIEJ)
This register disables or enables on a per-pin basis the edge sensitive external interrupt associated
with Port J.
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 24-58. Port J Interrupt Enable Register (PIEJ)
Figure 24-57. Port J Polarity Select Register (PPSJ)
Table 24-50. PERJ Field Descriptions
Table 24-51. PPSJ Field Descriptions
5
0
0
5
0
0
0
0
0
0
4
4
Description
Description
3
0
0
3
0
0
0
0
0
0
2
2
PPSJ1
PIEJ1
1
0
1
0
PPSJ0
PIEJ0
0
0
0
0