mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 840

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

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
22.3.2.17 Port T Data Register (PTT)
Read: Anytime.
Write: Anytime.
22.3.2.18 Port T Input Register (PTIT)
1
Read: Anytime.
Write: Never, writes to this register have no effect.
840
These registers are reset to zero. Two bus clock cycles after reset release the register values are updated with the associated
pin values.
PTIT[7:0]
Reset
PTT[7:0]
Reset
Field
Field
ECT
7–0
7–0
W
W
R
R
1
PTIT7
PTT7
IOC7
Port T — Port T bits 7–0 are associated with ECT channels IOC7–IOC0 (refer to ECT section). When not used
with the ECT, these pins can be used as general purpose I/O.
If the data direction bits of the associated I/O pins are set to logic level “1”, a read returns the value of the port
register, otherwise the buffered pin input state is read.
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.
—
0
7
7
= Unimplemented or Reserved
PTIT6
PTT6
IOC6
—
0
6
6
Figure 22-20. Port T Input Register (PTIT)
Figure 22-19. Port T Data Register (PTT)
Table 22-22. PTIT Field Descriptions
Table 22-21. PTT Field Descriptions
MC9S12XDP512 Data Sheet, Rev. 2.17
PTIT5
PTT5
IOC5
—
0
5
5
PTIT4
PTT4
IOC4
—
0
4
4
Description
Description
PTIT3
PTT3
IOC3
—
0
3
3
PTIT2
PTT2
IOC2
—
0
2
2
Freescale Semiconductor
PTIT1
PTT1
IOC1
—
0
1
1
PTIT0
PTT0
IOC0
—
0
0
0