mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 94

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1
1
Port Integration Module (S12XSPIMV1)
2.3.29
2.3.30
94
Address 0x024A
Address 0x024B
Read: Anytime.
Write: Anytime.
Read: Anytime.
Write: Anytime.
RDRS
PERS
Field
Field
Reset
Reset
7-0
7-0
W
W
R
R
Port S reduced drive—Select reduced drive for output pin
This bit configures the drive strength of the associated output pin as either full or reduced. If a pin is used as input
this bit has no effect. The reduced drive function is independent of which function is being used on a particular pin.
1 Reduced drive selected (approx. 1/5 of the full drive strength)
0 Full drive strength enabled
Port S pull device enable—Enable pull device on input pin or wired-or output pin
This bit controls whether a pull device on the associated port input pin is active. If a pin is used as output this bit has
only effect if used in wired-or mode. The polarity is selected by the related polarity select register bit.
1 Pull device enabled
0 Pull device disabled
RDRS7
PERS7
Port S Reduced Drive Register (RDRS)
Port S Pull Device Enable Register (PERS)
0
1
7
7
RDRS6
PERS6
Figure 2-28. Port S Pull Device Enable Register (PERS)
0
1
6
6
Figure 2-27. Port S Reduced Drive Register (RDRS)
Table 2-26. RDRS Register Field Descriptions
Table 2-27. PERS Register Field Descriptions
S12XS Family Reference Manual, Rev. 1.10
RDRS5
PERS5
0
1
5
5
RDRS4
PERS4
0
1
4
4
Description
Description
RDRS3
PERS3
3
0
3
1
RDRS2
PERS2
0
1
2
2
Freescale Semiconductor
RDRS1
PERS1
Access: User read/write
Access: User read/write
0
1
1
1
RDRS0
PERS0
0
1
0
0
1
1