mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 71

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1
1
2.3.21
2.3.22
Freescale Semiconductor
Address 0x024D
Address 0x024E
Read: Anytime
Write: Anytime
Read: Anytime
Write: Anytime
WOMS
PPSS
Field
Field
Reset
Reset
5-0
5-0
W
W
R
R
Pull device Polarity Select register port S — Configure pull device polarity on input pin
This bit selects a pullup or a pulldown device if enabled on the associated port input pin.
1 A pulldown device is selected
0 A pullup device is selected
Wired-Or Mode register port S — Enable open-drain functionality on output pin
This bit configures an output pin as wired-or (open-drain) or push-pull. 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
Port S Polarity Select Register (PPSS)
Port S Wired-Or Mode Register (WOMS)
0
0
0
0
7
7
0
0
0
0
6
6
Figure 2-20. Port S Wired-Or Mode Register (WOMS)
Figure 2-19. Port S Polarity Select Register (PPSS)
Table 2-22. WOMS Register Field Descriptions
Table 2-21. PPSS Register Field Descriptions
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
WOMS5
PPSS5
5
0
5
0
WOMS4
PPSS4
0
0
4
4
Description
Description
WOMS3
PPSS3
0
0
3
3
WOMS2
PPSS2
Port Integration Module (S12VRPIMV2)
0
0
2
2
WOMS1
PPSS1
Access: User read/write
Access: User read/write
0
0
1
1
WOMS0
PPSS0
0
0
0
0
71
1
1