PC912XDP512F0MPVR datasheet(1005/1348 Pages) FREESCALE

1005 / 1348 page

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.

24.0.5.26 Port M Data Register (PTM)

Read: Anytime.

Write: Anytime.

Port M pins 7–0 are associated with the CAN0, as well as the routed CAN0, CAN4, and SPI0

modules. When not used with any of the peripherals, these pins can be used as general purpose I/O.

If the data direction bits of the associated I/O pins are set to logic level “1”, a read returns the value

of the port register, otherwise the buffered pin input state is read.

Table 24-27. 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.

76543210

PTM7

PTM6

PTM5

PTM4

PTM3

PTM2

PTM1

PTM0

CAN

TXCAN0

RXCAN0

Routed

CAN0

TXCAN0

RXCAN0

TXCAN0

RXCAN0

Routed

CAN4

TXCAN4

RXCAN4

TXCAN4

RXCAN4

Routed

SPI0

SCK0

MOSI0

SS0

MISO0

Reset

00000000

Figure 24-28. Port M Data Register (PTM)

Table 24-28. PTM Field Descriptions

Field

Description

7–6

PTM[7:6]

The CAN4 function (TXCAN4 and RXCAN4) takes precedence over the general purpose I/O function if the CAN4

module is enabled. Refer to MSCAN section for details.

5–4

PTM[5:4]

The routed CAN0 function (TXCAN0 and RXCAN0) takes precedence over the routed CAN4, the routed SPI0

and the general purpose I/O function if the routed CAN0 module is enabled.

The routed CAN4 function (TXCAN4 and RXCAN4) takes precedence over the routed SPI0 and general purpose

I/O function if the routed CAN4 module is enabled. Refer to MSCAN section for details.

The routed SPI0 function (SCK0 and MOSI0) takes precedence of the general purpose I/O function if the routed

SPI0 is enabled. Refer to SPI section for details.

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