S912XHZ512F1VAG Datasheet, PDF (116/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 2 Port Integration Module (S12XHZPIMV1)
2.3.12.6 Port U Polarity Select Register (PPSU)
Module Base + 0x003D
R
W
Reset
7
PPSU7
0
6
PPSU6
5
PPSU5
4
PPSU4
3
PPSU3
2
PPSU2
0
0
0
0
0
Figure 2-71. Port U Polarity Select Register (PPSU)
1
PPSU1
0
0
PPSU0
0
Read: Anytime. Write: Anytime.
The Port U Polarity Select Register selects whether a pull-down or a pull-up device is connected to the pin.
The Port U Polarity Select Register is effective only when the corresponding Data Direction Register bit
is set to 0 (input) and the corresponding Pull Device Enable Register bit is set to 1.
Table 2-56. PPSU Field Descriptions
Field
Description
7:0
Pull Select Port U
PPSU[7:0] 0 A pull-up device is connected to the associated port U pin.
1 A pull-down device is connected to the associated port U pin.
MC9S12XHZ512 Data Sheet, Rev. 1.06
116
Freescale Semiconductor