MC9S12Q128_10 Datasheet, PDF (102/644 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 2 Port Integration Module (PIM9C32) Block Description
2.3.2.6.5 Port AD Pull Device Enable Register (PERAD)
Module Base + 0x0034
R
W
Reset
7
PERAD7
0
Read: Anytime.
Write: Anytime.
6
PERAD6
5
PERAD5
4
PERAD4
3
PERAD3
2
PERAD2
1
PERAD1
0
0
0
0
0
0
Figure 2-44. Port AD Pull Device Enable Register (PERAD)
Table 2-36. PERAD Field Descriptions
0
PERAD0
0
Field
Description
7–0
Pull Device Enable Port AD — This register configures whether a pull-up or a pull-down device is activated, if
PERAD[7:0] the port is used as input. This bit has no effect if the port is used as output. Out of reset no pull device is enabled.
It is not possible to enable pull devices when a associated ATD channel is enabled simultaneously.
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
2.3.2.6.6 Port AD Polarity Select Register (PPSAD)
Module Base + 0x0035
R
W
Reset
7
PPSAD7
0
Read: Anytime.
Write: Anytime.
6
PPSAD6
5
PPSAD5
4
PPSAD4
3
PPSAD3
2
PPSAD2
1
PPSAD1
0
0
0
0
0
0
Figure 2-45. Port AD Polarity Select Register (PPSAD)
Table 2-37. PPSAD Field Descriptions
0
PPSAD0
0
Field
Description
7–0
Pull Select Port AD — This register selects whether a pull-down or a pull-up device is connected to the pin.
PPSAD[7:0] 0 A pull-up device is connected to the associated port AD pin, if enabled by the associated bit in register PERAD
and if the port is used as input.
1 A pull-down device is connected to the associated port AD pin, if enabled by the associated bit in register
PERAD and if the port is used as input.
102
MC9S12Q128
Freescale Semiconductor
Rev 1.10