mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 146

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

Chapter 3 Port Integration Module (PIM9E256V1)
3.3.4.5
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.
3.3.4.6
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.
146
PERQ[6:0]
PPSQ[6:0]
Reset
Reset
Field
Field
6:0
6:0
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 Q
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.
Port Q Pull Device Enable Register (PERQ)
Port Q Polarity Select Register (PPSQ)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
PERQ6
PPSQ6
Figure 3-27. Port Q Pull Device Enable Register (PERQ)
0
0
6
6
Figure 3-28. Port Q Polarity Select Register (PPSQ)
Table 3-20. PERQ Field Descriptions
Table 3-21. PPSQ Field Descriptions
PERQ5
PPSQ5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
PERQ4
PPSQ4
0
0
4
4
Description
Description
PERQ3
PPSQ3
3
0
3
0
PERQ2
PPSQ2
0
0
2
2
PERQ1
PPSQ1
Freescale Semiconductor
0
0
1
1
PERQ0
PPSQ0
0
0
0
0