mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 841

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

22.3.2.19 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.
Freescale Semiconductor
DDRT[7:0]
Reset
Field
7–0
W
R
DDRT7
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
7
on PTT or PTIT registers, when changing the DDRT register.
DDRT6
0
6
Figure 22-21. Port T Data Direction Register (DDRT)
Table 22-23. DDRT Field Descriptions
DDRT5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
5
DDRT4
0
4
Description
Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
DDRT3
0
3
DDRT2
0
2
DDRT1
0
1
DDRT0
0
0
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