mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 144

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 3 Port Integration Module (PIM9E256V1)
3.3.4
Port Q is associated with the Pulse Width Modulator (PMF) modules. Each pin is assigned according to
the following priority: PMF > general-purpose I/O.
When a current status or fault function is enabled, the corresponding pin becomes an input. PQ[3:0] are
connected to FAULT[3:0] inputs and PQ[6:4] are connected to IS[2:0] inputs of the PMF module. Refer
to
enabling and disabling these PMF functions.
During reset, port Q pins are configured as high-impedance inputs.
3.3.4.1
Read: Anytime. Write: Anytime.
If the associated data direction bit (DDRQx) is set to 1 (output), a read returns the value of the I/O register
bit. If the associated data direction bit (DDRQx) is set to 0 (input), a read returns the value of the pin.
3.3.4.2
Read: Anytime. Write: Never, writes to this register have no effect.
This register always reads back the status of the associated pins.
144
Chapter 11, “Pulse Width Modulator with Fault Protection (PMF15B6CV2)”
Reset
Reset
PMF:
W
W
R
R
Port Q
Port Q I/O Register (PTQ)
Port Q Input Register (PTIQ)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
PTIQ6
PTQ5
IS2
0
u
6
6
Figure 3-24. Port Q Input Register (PTIQ)
Figure 3-23. Port Q I/O Register (PTQ)
PTIQ5
PTQ5
MC9S12E256 Data Sheet, Rev. 1.08
IS1
0
u
5
5
PTIQ4
PTQ4
IS0
0
u
4
4
u = Unaffected by reset
FAULT3
PTIQ3
PTQ3
3
0
3
u
FAULT2
PTIQ2
PTQ2
0
u
2
2
for information on
FAULT1
Freescale Semiconductor
PTIQ1
PTQ1
0
u
1
1
FAULT0
PTIQ0
PTQ0
0
u
0
0