MC9S12E64CFUE Datasheet, PDF (147/606 Pages) Freescale Semiconductor, Inc – Microcontrollers

3.3.4.5
Chapter 3 Port Integration Module (PIM9E128V1)
Port Q Pull Device Enable Register (PERQ)
7
R
0
W
6
PERQ6
5
PERQ5
4
PERQ4
3
PERQ3
2
PERQ2
1
PERQ1
0
PERQ0
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 3-27. Port Q Pull Device Enable Register (PERQ)
Read: Anytime. Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated on configured input pins. If
a pin is configured as output, the corresponding Pull Device Enable Register bit has no effect.
Table 3-20. PERP Field Descriptions
Field
6:0
Pull Device Enable Port P
PERQ[6:0] 0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Description
3.3.4.6 Port Q Polarity Select Register (PPSQ)
7
R
0
W
6
PPSQ6
5
PPSQ5
4
PPSQ4
3
PPSQ3
2
PPSQ2
1
PPSQ1
0
PPSQ0
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 3-28. Port Q Polarity Select Register (PPSQ)
Read: Anytime. Write: Anytime.
The Port Q Polarity Select Register selects whether a pull-down or a pull-up device is connected to the pin.
The Port Q Polarity Select Register is effective only when the corresponding Data Direction Register bit
is set to 0 (input) and the corresponding Pull Device Enable Register bit is set to 1.
Table 3-21. PPSP Field Descriptions
Field
Description
6:0
Polarity Select Port Q
PPSQ[6:0] 0 A pull-up device is connected to the associated port Q pin.
1 A pull-down device is connected to the associated port Q pin.
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor
147