mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 95

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1
1
2.3.31
2.3.32
Freescale Semiconductor
Address 0x024C
Address 0x024C
Read: Anytime.
Write: Anytime.
Read: Anytime.
Write: Anytime.
WOMS
PPSS
Field
Field
Reset
Reset
7-0
7-0
W
W
R
R
Port S pull device select—Configure pull device polarity on input pin
This bit selects a pull-up or a pull-down device if enabled on the associated port input pin.
1 A pull-down device selected
0 A pull-up device selected
Port S wired-or mode—Enable open-drain functionality on output pin
This bit configures an output pin as wired-or (open-drain) or push-pull independent of the function used on the pins.
In wired-or mode a logic “0” is driven active low while a logic “1” remains undriven. This allows a multipoint
connection of several serial modules. The bit has no influence on pins used as input.
1 Output buffer operates as open-drain output.
0 Output buffer operates as push-pull output.
WOMS7
PPSS7
Port S Polarity Select Register (PPSS)
Port S Wired-Or Mode Register (WOMS)
0
0
7
7
WOMS6
PPSS6
0
0
6
6
Figure 2-30. Port S Wired-Or Mode Register (WOMS)
Figure 2-29. Port S Polarity Select Register (PPSS)
Table 2-29. WOMS Register Field Descriptions
Table 2-28. PPSS Register Field Descriptions
S12XS Family Reference Manual, Rev. 1.10
WOMS5
PPSS5
0
0
5
5
WOMS4
PPSS4
0
0
4
4
Description
Description
WOMS3
PPSS3
3
0
3
0
WOMS2
PPSS2
0
0
Port Integration Module (S12XSPIMV1)
2
2
WOMS1
PPSS1
Access: User read/write
Access: User read/write
0
0
1
1
WOMS0
PPSS0
0
0
0
0
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1
1