PC912XDP512F0CFVR datasheet(925/1348 Pages) FREESCALE

925 / 1348 page

23.0.5.12 S12X_EBI Ports Reduced Drive Register (RDRIV)

Read: Anytime. In emulation modes, read operations will return the data from the external bus, in

all other modes the data source is depending on the data direction value.

Write: Anytime. In emulation modes, write operations will also be directed to the external bus.

This register is used to select reduced drive for the pins associated with ports A, B, E, and K. If

enabled, the pins drive at about 1/6 of the full drive strength. The reduced drive function is

independent of which function is being used on a particular pin.

The reduced drive functionality does not take effect on the pins in emulation modes.

76543210

RDPK

RDPE

RDPD

RDPC

RDPB

RDPA

Reset

00000000

= Unimplemented or Reserved

Figure 23-14. S12X_EBI Ports Reduced Drive Register (RDRIV)

Table 23-15. RDRIV Field Descriptions

Field

Description

RDPK

Reduced Drive of Port K

0 All port K output pins have full drive enabled.

1 All port K output pins have reduced drive enabled.

RDPE

Reduced Drive of Port E

0 All port E output pins have full drive enabled.

1 All port E output pins have reduced drive enabled.

RDPD

Reduced Drive of Port D

0 All port D output pins have full drive enabled.

1 All port D output pins have reduced drive enabled.

RDPC

Reduced Drive of Port C

0 All port C output pins have full drive enabled.

1 All port C output pins have reduced drive enabled.

RDPB

Reduced Drive of Port B

0 All port B output pins have full drive enabled.

1 All port B output pins have reduced drive enabled.

RDPA

Reduced Drive of Ports A

0 All Port A output pins have full drive enabled.

1 All port A output pins have reduced drive enabled.

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