S912XHZ512F1VAG Datasheet, PDF (78/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 2 Port Integration Module (S12XHZPIMV1)
2.3.5.2 Reduced Drive Register (RDRIV)
Module Base + 0x0055
7
6
R
0
RDPK
W
5
4
3
2
1
0
0
RDPE
RDPD
RDPC
RDPB
RDPA
Reset
0
0
0
0
0
0
0
0
= Reserved or Unimplemented
Figure 2-15. Reduced Drive Register (RDRIV)
Read: Anytime. Write: Anytime.
This register is used to select reduced drive for the pins associated with 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.
Table 2-10. RDRIV Field Descriptions
Field
7
RDPK
4
RDPE
3
RDPD
2
RDPC
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 D
0 All port D output pins have full drive enabled.
1 All port D output pins have reduced drive enabled.
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.
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 Port A
0 All Port A output pins have full drive enabled.
1 All port A output pins have reduced drive enabled.
MC9S12XHZ512 Data Sheet, Rev. 1.06
78
Freescale Semiconductor