MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 153
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MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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3.3.6.3
Read: Anytime. Write: Anytime.
This register configures port pins PT[7:0] as either input or output.
If the TIM0(1) module is enabled, each port pin configured for output compare is forced to be an output
and the associated Data Direction Register bit has no effect. If the associated timer output compare is
disabled, the corresponding DDRTx bit reverts to control the I/O direction of the associated pin.
If the TIM0(1) module is enabled, each port pin configured as an input capture has the corresponding
DDRTx bit controlling the I/O direction of the associated pin.
3.3.6.4
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
DDRT[7:0]
RDRT[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
DDRT7
RDRT7
Data Direction Port T
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Reduced Drive Port T
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Port T Data Direction Register (DDRT)
Port T Reduced Drive Register (RDRT)
0
0
7
7
DDRT6
RDRT6
0
0
6
6
Figure 3-39. Port T Reduced Drive Register (RDRT)
Figure 3-38. Port T Data Direction Register (DDRT)
Table 3-27. DDRT Field Descriptions
Table 3-28. RDRT Field Descriptions
DDRT5
RDRT5
MC9S12E128 Data Sheet, Rev. 1.07
0
0
5
5
DDRT4
RDRT4
0
0
4
4
Description
Description
DDRT3
RDRT3
0
0
3
3
Chapter 3 Port Integration Module (PIM9E128V1)
DDRT2
RDRT2
0
0
2
2
DDRT1
RDRT1
0
0
1
1
DDRT0
RDRT0
0
0
0
0
153
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