S912XEG384J3VA Datasheet, PDF (128/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

Chapter 2 Port Integration Module (S12XEPIMV1)
2.3.33 Port S Pull Device Enable Register (PERS)
Address 0x024C
R
W
Reset
7
PERS7
1
1. Read: Anytime.
Write: Anytime.
6
PERS6
5
PERS5
4
PERS4
3
PERS3
2
PERS2
Access: User read/write⁽¹⁾
1
0
PERS1
PERS0
1
1
1
1
1
1
1
Figure 2-31. Port S Pull Device Enable Register (PERS)
Table 2-30. PERS Register Field Descriptions
Field
7-0
PERS
Description
Port S pull device enable—Enable pull devices on input pins
These bits configure whether a pull device is activated, if the associated pin is used as an input. This bit has no effect
if the pin is used as an output. Out of reset all pull devices are enabled.
1 Pull device enabled.
0 Pull device disabled.
2.3.34 Port S Polarity Select Register (PPSS)
Address 0x024D
R
W
Reset
7
PPSS7
0
1. Read: Anytime.
Write: Anytime.
6
PPSS6
5
PPSS5
4
PPSS4
3
PPSS3
2
PPSS2
0
0
0
0
0
Figure 2-32. Port S Polarity Select Register (PPSS)
Access: User read/write⁽¹⁾
1
0
PPSS1
PPSS0
0
0
Table 2-31. PPSS Register Field Descriptions
Field
7-0
PPSS
Description
Port S pull device select—Determine pull device polarity on input pins
This register selects whether a pull-down or a pull-up device is connected to the pin.
1 A pull-down device is connected to the associated pin, if enabled and if the pin is used as input.
0 A pull-up device is connected to the associated pin, if enabled and if the pin is used as input.
MC9S12XE-Family Reference Manual Rev. 1.25
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Freescale Semiconductor