mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 153

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

3.3.6.5
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.
3.3.6.6
Read: Anytime. Write: Anytime.
The Port T Polarity Select Register selects whether a pull-down or a pull-up device is connected to the pin.
The Port T 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
PERT[7:0]
PPST[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
PERT7
PPST7
Pull Device Enable Port T
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Pull Select Port T
0 A pull-up device is connected to the associated port T pin.
1 A pull-down device is connected to the associated port T pin.
Port T Pull Device Enable Register (PERT)
Port T Polarity Select Register (PPST)
0
0
7
7
PERT6
PPST6
Figure 3-40. Port T Pull Device Enable Register (PERT)
0
0
6
6
Figure 3-41. Port T Polarity Select Register (PPST)
Table 3-29. PERT Field Descriptions
Table 3-30. PPST Field Descriptions
PERT5
PPST5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
PERT4
PPST4
0
0
4
4
Description
Description
PERT3
PPST3
3
0
3
0
Chapter 3 Port Integration Module (PIM9E256V1)
PERT2
PPST2
0
0
2
2
PERT1
PPST1
0
0
1
1
PERT0
PPST0
0
0
0
0
153