mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 143

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.3.3.5
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.
3.3.3.6
Read: Anytime. Write: Anytime.
The Port P Polarity Select Register selects whether a pull-down or a pull-up device is connected to the pin.
The Port P 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.
Freescale Semiconductor
PERP[5:0]
PPSP[5:0]
Reset
Reset
Field
Field
5:0
5:0
W
W
R
R
Pull Device Enable Port P
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Polarity Select Port P
0 A pull-up device is connected to the associated port P pin.
1 A pull-down device is connected to the associated port P pin.
Port P Pull Device Enable Register (PERP)
Port P Polarity Select Register (PPSP)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
Figure 3-21. Port P Pull Device Enable Register (PERP)
0
0
0
0
6
6
Figure 3-22. Port P Polarity Select Register (PPSP)
Table 3-16. PERP Field Descriptions
Table 3-17. PPSP Field Descriptions
PERP5
PPSP5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
PERP4
PPSP4
0
0
4
4
Description
Description
PERP3
PPSP3
3
0
3
0
Chapter 3 Port Integration Module (PIM9E256V1)
PERP2
PPSP2
0
0
2
2
PERP1
PPSP1
0
0
1
1
PERP0
PPSP0
0
0
0
0
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