MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 141

• Manufacturer Part Number: MC9S12E32CFU
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

3.3.2.7
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 SCI2 outputs and allow a multipoint connection of several serial modules.
If the IIC is enabled, the associated pins are always set to wired-or mode, and the state of the WOMM[7:6]
bits have no effect. The WOMM[7:6] bits will not change to reflect their wired-or mode configuration
when the IIC is enabled.
Freescale Semiconductor
WOMM[7:4]
Reset
Field
7:4
W
R
WOMM7
Wired-OR Mode Port M
0 Output buffers operate as push-pull outputs.
1 Output buffers operate as open-drain outputs.
Port M Wired-OR Mode Register (WOMM)
0
7
= Reserved or Unimplemented
WOMM6
0
6
Figure 3-16. Port M Wired-OR Mode Register (WOMM)
Table 3-13. WOMM Field Descriptions
WOMM5
MC9S12E128 Data Sheet, Rev. 1.07
0
5
WOMM4
0
4
Description
0
0
3
Chapter 3 Port Integration Module (PIM9E128V1)
0
0
2
0
0
1
0
0
0
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