mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 932

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
23.0.5.19 Port T Data Direction Register (DDRT)
Read: Anytime.
Write: Anytime.
This register configures each port T pin as either input or output.
The ECT forces the I/O state to be an output for each timer port associated with an enabled output compare.
In this case the data direction bits will not change.
The DDRT bits revert to controlling the I/O direction of a pin when the associated timer output compare
is disabled.
The timer input capture always monitors the state of the pin.
23.0.5.20 Port T Reduced Drive Register (RDRT)
Read: Anytime.
Write: Anytime.
932
DDRT[7:0]
PTIT[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
DDRT7
RDRT7
Port T Input — This register always reads back the buffered state of the associated pins. This can also be used
to detect overload or short circuit conditions on output pins.
Data Direction Port T
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read
0
0
7
7
on PTT or PTIT registers, when changing the DDRT register.
DDRT6
RDRT6
0
0
6
6
Figure 23-22. Port T Reduced Drive Register (RDRT)
Figure 23-21. Port T Data Direction Register (DDRT)
Table 23-23. DDRT Field Descriptions
Table 23-22. PTIT Field Descriptions
DDRT5
RDRT5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
DDRT4
RDRT4
0
0
4
4
Description
Description
DDRT3
RDRT3
0
0
3
3
DDRT2
RDRT2
0
0
2
2
DDRT1
RDRT1
Freescale Semiconductor
0
0
1
1
DDRT0
RDRT0
0
0
0
0