Datasheet

Chapter 2 Port Integration Module (S12XEPIMV1)
MC9S12XE-Family Reference Manual Rev. 1.25
128 Freescale Semiconductor
2.3.33 Port S Pull Device Enable Register (PERS)
2.3.34 Port S Polarity Select Register (PPSS)
Address 0x024C Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
PERS7 PERS6 PERS5 PERS4 PERS3 PERS2 PERS1 PERS0
W
Reset 11111111
Figure 2-31. Port S Pull Device Enable Register (PERS)
Table 2-30. PERS Register Field Descriptions
Field Description
7-0
PERS
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.
Address 0x024D Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
PPSS7 PPSS6 PPSS5 PPSS4 PPSS3 PPSS2 PPSS1 PPSS0
W
Reset 00000000
Figure 2-32. Port S Polarity Select Register (PPSS)
Table 2-31. PPSS Register Field Descriptions
Field Description
7-0
PPSS
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.