Datasheet

Chapter 3 Port Integration Module (PIM9E128V1)
MC9S12E128 Data Sheet, Rev. 1.07
154 Freescale Semiconductor
3.3.6.5 Port T Pull Device Enable Register (PERT)
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 Port T Polarity Select Register (PPST)
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.
76543210
R
PERT7 PERT6 PERT5 PERT4 PERT3 PERT2 PERT1 PERT0
W
Reset 0 0 0 00000
Figure 3-40. Port T Pull Device Enable Register (PERT)
Table 3-29. PERT Field Descriptions
Field Description
7:0
PERT[7:0]
Pull Device Enable Port T
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
76543210
R
PPST7 PPST6 PPST5 PPST4 PPST3 PPST2 PPST1 PPST0
W
Reset 0 0 0 00000
Figure 3-41. Port T Polarity Select Register (PPST)
Table 3-30. PPST Field Descriptions
Field Description
7:0
PPST[7:0]
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.