MC9S12HZ256 Datasheet, PDF (147/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 4 Port Integration Module (PIM9HZ256V2)
Table 4-26. PPSS Field Descriptions
Field
Description
7:4
Pull Select Port S
PPSS[7:4] 0 A pull-up device is connected to the associated port S pin.
1 A pull-down device is connected to the associated port S pin.
1:0
Pull Select Port S
PPSS[1:0] 0 A pull-up device is connected to the associated port S pin.
1 A pull-down device is connected to the associated port S pin.
4.3.5.7 Port S Wired-OR Mode Register (WOMS)
7
6
5
4
3
R
0
WOMS7
WOMS6
WOMS5
WOMS4
W
2
1
0
0
WOMS1
WOMS0
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 4-36. Port S Wired-OR Mode Register (WOMS)
Read: Anytime. Write: Anytime.
This register selects whether a port S 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.
Table 4-27. WOMS Field Descriptions
Field
Description
7:4
Wired-OR Mode Port S
WOMS[7:4] 0 Output buffers operate as push-pull outputs.
1 Output buffers operate as open-drain outputs.
1:0
Wired-OR Mode Port S
WOMS[1:0] 0 Output buffers operate as push-pull outputs.
1 Output buffers operate as open-drain outputs.
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
147