PC912XDP512F0CFVR datasheet(937/1348 Pages) FREESCALE

937 / 1348 page

23.0.5.31 Port M Input Register (PTIM)

Read: Anytime.

Write: Never, writes to this register have no effect.

This register always reads back the buffered state of the associated pins. This can also be used to

detect overload or short circuit conditions on output pins.

23.0.5.32 Port M Data Direction Register (DDRM)

Read: Anytime.

Write: Anytime.

This register configures each port M pin as either input or output.

The CAN forces the I/O state to be an output for each port line associated with an enabled output

(TXCAN). also forces the I/O state to be an input for each port line associated with an enabled

input (RXCAN). In those cases the data direction bits will not change.

The DDRM bits revert to controlling the I/O direction of a pin when the associated peripheral

module is disabled.

76543210

PTIM7

PTIM6

PTIM5

PTIM4

PTIM3

PTIM2

PTIM1

PTIM0

Reset1

1. These registers are reset to zero. Two bus clock cycles after reset release the register values are updated with the

associated pin values.

————————

= Unimplemented or Reserved

Figure 23-33. Port M Input Register (PTIM)

76543210

DDRM7

DDRM6

DDRM5

DDRM4

DDRM3

DDRM2

DDRM1

DDRM0

Reset

00000000

Figure 23-34. Port M Data Direction Register (DDRM)

Table 23-33. DDRM Field Descriptions

Field

Description

7–0

DDRM[7:0]

Data Direction Port M

0 Associated pin is conﬁgured as input.

1 Associated pin is conﬁgured as output.

Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read

on PTM or PTIM registers, when changing the DDRM register.

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