MC9S12XHZ512 Datasheet, PDF (100/1016 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 2 Port Integration Module (S12XHZPIMV1)
The IIC function takes precedence over the general-purpose I/O function if the IIC bus is enabled and the
corresponding PWM channels remain disabled. The SDA and SCL pins are bidirectional with outputs
configured as open-drain.
If enabled, the SCI1 transmitter takes precedence over the general-purpose I/O function, and the
corresponding TXD1 pin is configured as an output. If enabled, the SCI1 receiver takes precedence over
the general-purpose I/O function, and the corresponding RXD1 pin is configured as an input.
2.3.9.2 Port P Input Register (PTIP)
7
R PTIP7
W
6
PTIP6
5
PTIP5
4
PTIP4
3
PTIP3
2
PTIP2
Reset
u
u
u
u
u
u
= Reserved or Unimplemented
u = Unaffected by reset
Figure 2-43. Port P I/O Register (PTP)
Read: Anytime. Write: Never, writes to this register have no effect.
This register always reads back the status of the associated pins.
2.3.9.3 Port P Data Direction Register (DDRP)
1
PTIP1
u
0
PTIP0
u
7
R
DDRP7
W
6
DDRP6
5
DDRP5
4
DDRP4
3
DDRP3
2
DDRP2
1
DDRP1
0
DDRP0
Reset
0
0
0
0
0
0
0
0
Figure 2-44. Port P Data Direction Register (DDRP)
Read: Anytime. Write: Anytime.
This register configures port pins PP[7:0] as either input or output.
If a PWM channel is enabled, the corresponding pin is forced to be an output and the associated Data
Direction Register bit has no effect. Channel 5 can also force the corresponding pin to be an input if the
shutdown feature is enabled.
When an IIC bus is enabled, the corresponding pins become the SCL and SDA bidirectional pins
respectively as long as the corresponding PWM channels are disabled. The associated Data Direction
Register bits have no effect.
When the SCI1 transmitter is enabled, the PP[0] pin becomes the TXD1 output pin and the associated Data
Direction Register bit has no effect. When the SCI1 receiver is enabled, the PP[2] pin becomes the RXD1
input pin and the associated Data Direction Register bit has no effect.
MC9S12XHZ512 Data Sheet, Rev. 1.03
100
Freescale Semiconductor