S912XHY128F0VLM Datasheet, PDF (140/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Port Integration Module (S12XHYPIMV1)
2.3.85 Port U Pull Device Enable Register (PERU)
Address 0x0294
R
W
Reset
7
PERU7
0
1 _{Read: Anytime.}
Write: Anytime.
6
PERU6
5
PERU5
4
PERU4
3
PERU3
2
PERU2
0
0
0
0
0
Figure 2-82. Port U Pull Device Enable Register (PERU)
Access: User read/write¹
1
0
PERU1
PERU0
0
0
Table 2-69. PERU Register Field Descriptions
Field
7-0
PERU
Description
Port U 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 no pull device is enabled.
1 Pull device enabled.
0 Pull device disabled.
2.3.86 Port U Polarity Select Register (PPSU)
Address 0x0295
R
W
Reset
7
PPSU7
0
1 _{Read: Anytime.}
Write: Anytime.
6
PPSU6
5
PPSU5
4
PPSU4
3
PPSU3
2
PPSU2
0
0
0
0
0
Figure 2-83. Port U Polarity Select Register (PPSU)
Access: User read/write¹
1
0
PPSU1
PPSU0
0
0
Table 2-70. PPSU Register Field Descriptions
Field
7-0
PPSU
Description
Port U pull device select—Determine pull device polarity on input pins
This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting a pull-up
or pull-down device if enabled.
1 A pull-down device is connected to the associated Port U pin, if enabled by the associated bit in register PERU and
if the port is used as input.
0 A pull-up device is connected to the associated Port U pin, if enabled by the associated bit in register PERU and
if the port is used as input.
MC9S12XHY-Family Reference Manual, Rev. 1.01
140
Freescale Semiconductor