mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 145

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

3.3.4.3
Read: Anytime. Write: Anytime.
This register configures port pins PQ[6:0] as either input or output.
If a PMF function is enabled, the corresponding pin is forced to be an input 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.
3.3.4.4
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.
Freescale Semiconductor
DDRQ[6:0]
RDRQ[6:0]
Reset
Reset
Field
Field
6:0
6:0
W
W
R
R
Data Direction Port Q
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Reduced Drive Port Q
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Port Q Data Direction Register (DDRQ)
Port Q Reduced Drive Register (RDRQ)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
DDRQ6
RDRQ6
0
0
6
6
Figure 3-26. Port Q Reduced Drive Register (RDRQ)
Figure 3-25. Port Q Data Direction Register (DDRQ)
Table 3-18. DDRQ Field Descriptions
Table 3-19. RDRQ Field Descriptions
DDRQ5
RDRQ5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
DDRQ4
RDRQ4
0
0
4
4
Description
Description
DDRQ3
RDRQ3
3
0
3
0
Chapter 3 Port Integration Module (PIM9E256V1)
DDRQ2
RDRQ2
0
0
2
2
DDRQ1
RDRQ1
0
0
1
1
DDRQ0
RDRQ0
0
0
0
0
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