P912XDP512F0MPVR datasheet(833/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

835

22.3.2.12 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 are read from this register.

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 the S12X_EBI ports A, B, C, D,

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 22-14. S12X_EBI Ports Reduced Drive Register (RDRIV)

Table 22-15. 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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