MC9S12E128CFUE Datasheet, PDF (140/606 Pages) Freescale Semiconductor, Inc – MC9S12E128 Data Sheet

Chapter 3 Port Integration Module (PIM9E128V1)
3.3.2.5 Port M Pull Device Enable Register (PERM)
7
6
5
4
3
2
1
0
R
0
PERM7
PERM6
PERM5
PERM4
PERM3
PERM1
PERM0
W
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 3-14. Port M Pull Device Enable Register (PERM)
Read: Anytime. Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated on configured input or
wired-or output pins. If a pin is configured as push-pull output, the corresponding Pull Device Enable
Register bit has no effect.
Table 3-11. PERM Field Descriptions
Field
7:3, 1:0 Pull Device Enable Port M
PERM[7:3, 0 Pull-up or pull-down device is disabled.
1:0]
1 Pull-up or pull-down device is enabled.
Description
3.3.2.6 Port M Polarity Select Register (PPSM)
7
6
5
4
3
2
1
0
R
0
PPSM7
PPSM6
PPSM5
PPSM4
PPSM3
PPSM1
PPSM0
W
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 3-15. Port M Polarity Select Register (PPSM)
Read: Anytime. Write: Anytime.
The Port M Polarity Select Register selects whether a pull-down or a pull-up device is connected to the
pin. The Port M 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 3-12. PPSM Field Descriptions
Field
Description
7:3, 1:0 Pull Select Port M
PPSM[7:3, 0 A pull-up device is connected to the associated port M pin.
1:0]
1 A pull-down device is connected to the associated port M pin.
MC9S12E128 Data Sheet, Rev. 1.07
140
Freescale Semiconductor