MC9S12T64 Datasheet, PDF (263/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Port Integration Module (PIM)
Register Descriptions
PPSS[7:0] — Pull Select Port S
1 = A pull-down device is connected to the associated port S pin, if
enabled by the associated bit in register PERS and if the port
is used as input.
0 = A pull-up device is connected to the associated port S pin, if
enabled by the associated bit in register PERS and if the port
is used as input or as wired-or output.
Port S Wired-Or
Mode Register
(WOMS)
Address Offset: $00EE
Bit 7
Read:
WOMS7
Write:
Reset: 0
6
5
4
WOMS6 WOMS5 WOMS4
0
0
0
= Reserved or unimplemented
3
WOMS3
0
2
WOMS2
0
1
WOMS1
0
Bit 0
WOMS0
0
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 SPI and SCI outputs and allows a multipoint
connection of several serial modules. This bit has no influence on pins
used as inputs.
WOMS[7:0] — Wired-Or Mode Port S
1 = Output buffers operate as open-drain outputs.
0 = Output buffers operate as push-pull outputs.
Port Integration Module (PIM)
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MC9S12T64Revision 1.1.1