mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 853

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

22.3.2.35 Port M Polarity Select Register (PPSM)
Read: Anytime.
Write: Anytime.
This register selects whether a pull-down or a pull-up device is connected to the pin. If CAN is active a
pull-up device can be activated on the RXCAN[3:0] inputs, but not a pull-down.
22.3.2.36 Port M Wired-OR Mode Register (WOMM)
Read: Anytime.
Write: Anytime.
This register configures the output pins as wired-OR. If enabled the output is driven active low only
(open-drain). A logic level of “1” is not driven. It applies also to the CAN outputs and allows a multipoint
connection of several serial modules. This bit has no influence on pins used as inputs.
Freescale Semiconductor
WOMM[7:0]
PPSM[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
WOMM7
PPSM7
Pull Select Port M
0 A pull-up device is connected to the associated port M pin, if enabled by the associated bit in register PERM
1 A pull-down device is connected to the associated port M pin, if enabled by the associated bit in register PERM
Wired-OR Mode Port M
0 Output buffers operate as push-pull outputs.
1 Output buffers operate as open-drain outputs.
0
0
7
7
and if the port is used as general purpose or RXCAN input.
and if the port is used as a general purpose but not as RXCAN.
WOMM6
PPSM6
Figure 22-38. Port M Wired-OR Mode Register (WOMM)
0
0
6
6
Figure 22-37. Port M Polarity Select Register (PPSM)
Table 22-37. WOMM Field Descriptions
Table 22-36. PPSM Field Descriptions
WOMM5
PPSM5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
WOMM4
PPSM4
0
0
4
4
Description
Description
Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
WOMM3
PPSM3
0
0
3
3
WOMM2
PPSM2
0
0
2
2
WOMM1
PPSM1
0
0
1
1
WOMM0
PPSM0
0
0
0
0
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