PC912XDP512F0MPVR datasheet(865/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

867

22.3.2.54 Port J Data Register (PTJ)

Read: Anytime.

Write: Anytime.

Port J pins 7–4 and 2–0 are associated with the CAN4, SCI2, IIC0 and IIC1, the routed CAN0 modules

and chip select signals (CS0, CS1, CS2, CS3). 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.

76543210

PTJ7

PTJ6

PTJ5

PTJ4

PTJ2

PTJ1

PTJ0

CAN4/

SCI2

TXCAN4

RXCAN4

TXD2

RXD2

IICO

SCL0

SDA0

IIC1

SCL1

SDA1

Routed

CAN0

TXCAN0

RXCAN0

Alt.

Function

CS2

CS0

CS1

CS3

Reset

00000000

= Unimplemented or Reserved

Figure 22-56. Port J Data Register (PTJ)

Table 22-51. PTJ Field Descriptions

Field

Description

7–6

PJ[7:0]

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.

5-4

PJ[5:4]

The IIC1 function (SCL1 and SDA1) takes precedence over the chip select (CS0, CS2) and general purpose I/O

function if the IIC1 is enabled. The chip selects (CS0, CS2) take precedence over the general purpose I/O. If the

IIC1 module takes precedence the SDA1 and SCL1 outputs are conﬁgured as open drain outputs. Refer to IIC

section for details.

PJ2

The chip select function (CS1) takes precedence over the general purpose I/O.

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