mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 142

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 3 Port Integration Module (PIM9E256V1)
3.3.3.3
Read: Anytime. Write: Anytime.
This register configures port pins PP[5:0] as either input or output.
If a PMF channel is enabled, the corresponding pin is forced to be an output and the associated Data
Direction Register bit has no effect. If a PMF channel is disabled, the corresponding Data Direction
Register bit reverts to control the I/O direction of the associated pin.
3.3.3.4
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.
142
DDRP[5:0]
RDRP[5:0]
Reset
Reset
Field
Field
5:0
5:0
W
W
R
R
Data Direction Port P
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Reduced Drive Port P
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Port P Data Direction Register (DDRP)
Port P Reduced Drive Register (RDRP)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
0
0
0
0
6
6
Figure 3-20. Port P Reduced Drive Register (RDRP)
Figure 3-19. Port P Data Direction Register (DDRP)
Table 3-14. DDRP Field Descriptions
Table 3-15. RDRP Field Descriptions
DDRP5
RDRP5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
DDRP4
RDRP4
0
0
4
4
Description
Description
DDRP3
RDRP3
3
0
3
0
DDRP2
RDRP2
0
0
2
2
DDRP1
RDRP1
Freescale Semiconductor
0
0
1
1
DDRP0
RDRP0
0
0
0
0