MC9S12E128 Datasheet, PDF (132/606 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 3 Port Integration Module (PIM9E128V1)
3.3.1.4 Port AD Reduced Drive Register (RDRAD)
7
R
RDRAD15
W
Reset
0
6
RDRAD14
0
5
RDRAD13
0
4
RDRAD12
0
3
RDRAD11
0
2
RDRAD10
0
1
RDRAD9
0
0
RDRAD8
0
7
R
RDRAD7
W
Reset
0
6
RDRAD6
5
RDRAD5
4
RDRAD4
3
RDRAD3
2
RDRAD2
0
0
0
0
0
Figure 3-5. Port AD Reduced Drive Register (RDRAD)
1
RDRAD1
0
0
RDRAD0
0
Read: Anytime. Write: Anytime.
This register configures the drive strength of configured output pins as either full or reduced. If a pin is
configured as input, the corresponding Reduced Drive Register bit has no effect.
Table 3-4. RDRAD Field Descriptions
Field
Description
15:0
Reduced Drive Port AD
RDRAD[15:0] 0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
MC9S12E128 Data Sheet, Rev. 1.07
132
Freescale Semiconductor