PC912XDP512F0MPVR datasheet(851/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

853

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.

76543210

PPSM7

PPSM6

PPSM5

PPSM4

PPSM3

PPSM2

PPSM1

PPSM0

Reset

00000000

Figure 22-37. Port M Polarity Select Register (PPSM)

Table 22-36. PPSM Field Descriptions

Field

Description

7–0

PPSM[7:0]

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

and if the port is used as general purpose or RXCAN input.

1 A pull-down device is connected to the associated port M pin, if enabled by the associated bit in register PERM

and if the port is used as a general purpose but not as RXCAN.

76543210

WOMM7

WOMM6

WOMM5

WOMM4

WOMM3

WOMM2

WOMM1

WOMM0

Reset

00000000

Figure 22-38. Port M Wired-OR Mode Register (WOMM)

Table 22-37. WOMM Field Descriptions

Field

Description

7–0

WOMM[7:0]

Wired-OR Mode Port M

0 Output buffers operate as push-pull outputs.

1 Output buffers operate as open-drain outputs.

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