MC9S12XD256CAL Datasheet, PDF (995/1348 Pages) Freescale Semiconductor, Inc – This specification describes the function of the clocks and reset generator (CRG).

24.0.5.8 S12X_EBI Ports Reduced Drive Register (RDRIV)
7
6
R
0
RDPK
W
5
4
3
2
1
0
RDPE
RDPD¹
RDPC¹
RDPB
Reset
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 24-10. S12X_EBI Ports Reduced Drive Register (RDRIV)
1. Register implemented, function disabled: Written values can be read back.
0
RDPA
0
Read: Anytime.
Write: Anytime.
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.
Table 24-11. RDRIV Field Descriptions
Field
7
RDPK
4
RDPE
1
RDPB
0
RDPA
Description
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.
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.
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.
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.