PC912XDP512F0MPVR datasheet(1018/1348 Pages) FREESCALE

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Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1020

Freescale Semiconductor

24.0.5.50 Port J Data Register (PTJ)

Read: Anytime.

Write: Anytime.

Port J pins 7–6 are associated with the CAN4, IIC0, the routed CAN0 modules. These pins can be used as

general purpose I/O when not used with any of the peripherals.

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 except for bits 5-2 which read “0”.

Table 24-46. PIFH Field Descriptions

Field

Description

7–0

PIFH[7:0]

Interrupt Flags Port H

0 No active edge pending. Writing a “0” has no effect.

1 Active edge on the associated bit has occurred (an interrupt will occur if the associated enable bit is set).

Writing a logic level “1” clears the associated ﬂag.

76543210

PTJ7

PTJ6

0000

PTJ1

PTJ0

CAN4

TXCAN4

RXCAN4

IIC0

SCL0

SDA0

Routed

CAN0

TXCAN0

RXCAN0

Reset

00000000

= Unimplemented or Reserved

Figure 24-52. Port J Data Register (PTJ)

Table 24-47. PTJ Field Descriptions

Field

Description

7–6

PJ[7:6]

The CAN4 function (TXCAN4 and RXCAN4) takes precedence over the IIC0, the routed CAN0 and the general

purpose I/O function if the CAN4 module is enabled.

The IIC0 function (SCL0 and SDA0) takes precedence over the routed CAN0 and the general purpose I/O

function if the IIC0 is enabled. If the IIC0 module takes precedence the SDA0 and SCL0 outputs are conﬁgured

as open drain outputs. Refer to IIC section for details.

The routed CAN0 function (TXCAN0 and RXCAN0) takes precedence over the general purpose I/O function if

the routed CAN0 module is enabled. Refer to MSCAN section for details.

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