Datasheet

23.0.5.29 Port S Wired-OR Mode Register (WOMS)

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. These bits have no influence on pins used as

inputs.

Table 23-30. PPSS Field Descriptions

Field Description

7–0

PPSS[7:0]

Pull Select Port S

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.

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.

76543210

WOMS7 WOMS6 WOMS5 WOMS4 WOMS3 WOMS2 WOMS1 WOMS0

Reset 00000000

Figure 23-31. Port S Wired-OR Mode Register (WOMS)

Table 23-31. WOMS Field Descriptions

Field Description

7–0

WOMS[7:0]

Wired-OR Mode Port S

0 Output buffers operate as push-pull outputs.

1 Output buffers operate as open-drain outputs.