mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 863

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1. Read: Anytime.
1. Read: Anytime.
19.3.23 Port T Data Direction Register (DDRT)
Freescale Semiconductor
Address 0x0242
Write:Never, writes to this register have no effect.
Write: Anytime.
DDRT
Field
Field
PTIT
Reset
7-0
7-0
W
R
Port T input data—
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.
Port T data direction—
This register controls the data direction of pins 7 through 0.
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 data direction 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.
1 Associated pin is configured as output.
0 Associated pin is configured as high-impedance input.
DDRT7
0
7
Due to internal synchronization circuits, it can take up to 2 bus clock cycles
until the correct value is read on PTT or PTIT registers, when changing the
DDRT register.
DDRT6
0
6
Figure 19-21. Port T Data Direction Register (DDRT)
Table 19-22. DDRT Register Field Descriptions
Table 19-21. PTIT Register Field Descriptions
MC9S12XF - Family Reference Manual, Rev.1.19
DDRT5
0
5
DDRT4
NOTE
0
4
Description
Description
DDRT3
3
0
Chapter 19 Port Integration Module (S12XFPIMV2)
DDRT2
0
2
Access: User read/write
DDRT1
0
1
DDRT0
0
0
863
(1)