S9S12XS256J0CAL Datasheet, PDF (123/738 Pages) Freescale Semiconductor, Inc – Microcontrollers

Port Integration Module (S12XSPIMV1)
2.4.2.7 Wired-or mode register (WOMx)
If the pin is used as an output this register turns off the active high drive. This allows wired-or type
connections of outputs.
2.4.2.8 Interrupt enable register (PIEx)
If the pin is used as an interrupt input this register serves as a mask to the interrupt flag to enable/disable
the interrupt.
2.4.2.9 Interrupt flag register (PIFx)
If the pin is used as an interrupt input this register holds the interrupt flag after a valid pin event.
2.4.2.10 Module routing registers (MODRR, PTTRR)
These registers allow software re-configuration of the pinouts of the different package options for specific
peripherals:
• MODRR supports the re-routing of the SCI1 and SPI0 pins to alternative ports
• PTTRR supports the re-routing of the PWM and TIM channels to alternative ports
2.4.3
Pins and Ports
NOTE
Please refer to the device pinout section to determine the pin availability in
the different package options.
2.4.3.1 BKGD pin
The BKGD pin is associated with the BDM module.
During reset, the BKGD pin is used as MODC input.
2.4.3.2 Port A, B
Port A pins PA[7:0] and Port B pins PB[7:0] can be used for general-purpose I/O.
2.4.3.3 Port E
Port E is associated with the free-running clock outputs ECLK, ECLKX2 and interrupt inputs IRQ and
XIRQ.
Port E pins PE[7:2] can be used for either general-purpose I/O or with the alternative functions.
Port E pin PE[7] an be used for either general-purpose I/O or as the free-running clock ECLKX2 output
running at the core clock rate.
Port E pin PE[4] an be used for either general-purpose I/O or as the free-running clock ECLK output
running at the bus clock rate or at the programmed divided clock rate.
S12XS Family Reference Manual, Rev. 1.13
Freescale Semiconductor
123