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Chapter 19 Port Integration Module (S12XFPIMV2)
MC9S12XF - Family Reference Manual, Rev.1.19
856
Freescale Semiconductor
19.3.14 S12X_EBI ports Reduced Drive Register (RDRIV)
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.
3
PUPDE
Pull-up Port D Enable—Enable pull-up devices on all Port D input pins
This bit congures whether pull-up devices are activated, if the pins are used as inputs. This bit has no effect if the
pins are used as outputs. Out of reset the pull-up devices are disabled.
1 Pull-up devices enabled.
0 Pull-up devices disabled.
2
PUPCE
Pull-up Port C Enable—Enable pull-up devices on all Port C input pins
This bit congures whether pull-up devices are activated, if the pins are used as inputs. This bit has no effect if the
pins are used as outputs. Out of reset the pull-up devices are disabled.
1 Pull-up devices enabled.
0 Pull-up devices disabled.
1
PUPBE
Pull-up Port B Enable—Enable pull-up devices on all Port B input pins
This bit congures whether pull-up devices are activated, if the pins are used as inputs. This bit has no effect if the
pins are used as outputs. Out of reset the pull-up devices are disabled.
1 Pull-up devices enabled.
0 Pull-up devices disabled.
0
PUPAE
Pull-up Port A Enable—Enable pull-up devices on all Port A input pins
This bit congures whether pull-up devices are activated, if the pins are used as inputs. This bit has no effect if the
pins are used as outputs. Out of reset the pull-up devices are disabled.
1 Pull-up devices enabled.
0 Pull-up devices disabled.
Address 0x000D (PRR)
Access: User read/write(1)
1. 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.
76543210
R
RDPK
00
RDPE
RDPD
RDPC
RDPB
RDPA
W
Reset
00000000
= Unimplemented or Reserved
u = Unaffected by reset
Figure 19-12. S12X_EBI ports Reduced Drive Register (RDRIV)
Table 19-14. PUCR Register Field Descriptions (continued)
Field
Description