mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1010

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
This register configures whether a pull-up or a pull-down device is activated, if the port is used as input or
wired-OR output. This bit has no effect if the port is used as push-pull output. Out of reset no pull device
is enabled.
24.0.5.31 Port M Polarity Select Register (PPSM)
Read: Anytime.
Write: Anytime.
This register selects whether a pull-down or a pull-up device is connected to the pin. If CAN is active, a
pull-up device can be activated on the related RXCAN inputs, but not a pull-down.
24.0.5.32 Port M Wired-OR Mode Register (WOMM)
Read: Anytime.
Write: Anytime.
1010
PERM[7:0]
PPSM[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
WOMM7
PPSM7
Pull Device Enable Port M
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
Pull Select Port M
0 A pull-up device is connected to the associated port M pin, if enabled by the associated bit in register PERM
1 A pull-down device is connected to the associated port M pin, if enabled by the associated bit in register PERM
0
0
7
7
and if the port is used as general purpose or RXCAN input.
and if the port is used as a general purpose but not as RXCAN.
WOMM6
PPSM6
Figure 24-34. Port M Wired-OR Mode Register (WOMM)
0
0
6
6
Figure 24-33. Port M Polarity Select Register (PPSM)
Table 24-31. PERM Field Descriptions
Table 24-32. PPSM Field Descriptions
WOMM5
PPSM5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
WOMM4
PPSM4
0
0
4
4
Description
Description
WOMM3
PPSM3
0
0
3
3
WOMM2
PPSM2
0
0
2
2
WOMM1
PPSM1
Freescale Semiconductor
0
0
1
1
WOMM0
PPSM0
0
0
0
0