MC9S12HZ256 Datasheet, PDF (137/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 4 Port Integration Module (PIM9HZ256V2)
Table 4-16. PPSM Field Descriptions
Field
Description
5:2
Pull Select Port M
PPSM[5:2] 0 A pull-up device is connected to the associated port M pin.
1 A pull-down device is connected to the associated port M pin.
4.3.3.7 Port M Wired-OR Mode Register (WOMM)
7
6
5
4
3
2
1
0
R
0
0
0
0
WOMM5 WOMM4 WOMM3 WOMM2
W
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 4-22. Port M Wired-OR Mode Register (WOMM)
Read: Anytime. Write: Anytime.
This register selects whether a port M output is configured as push-pull or wired-or. When a Wired-OR
Mode Register bit is set to 1, the corresponding output pin is driven active low only (open drain) and a
high level is not driven. A Wired-OR Mode Register bit has no effect if the corresponding pin is configured
as an input.
These bits apply also to the CAN transmitter and allow a multipoint connection of several serial modules.
Table 4-17. WOMM Field Descriptions
Field
Description
5:2
Wired-OR Mode Port M
WOMM[5:2] 0 Output buffers operate as push-pull outputs.
1 Output buffers operate as open-drain outputs.
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
137