S912XEG128J2MAA Datasheet, PDF (182/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2 Port Integration Module (S12XEPIMV1)
Port E pin PE[6] can be used for either general-purpose I/O, as TAGHI input or as MODB input during
reset.
Port E pin PE[5] can be used for either general-purpose I/O, as TAGLO input, RE output or as MODA
input during reset.
Port E pin PE[4] can 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. The clock output is always enabled
in emulation modes.
Port E pin PE[3] can be used for either general-purpose I/O, as LSTRB or LDS output, or as EROMCTL
input during reset.
Port E pin PE[2] can be used for either general-purpose I/O, or as RW or WE output.
Port E pin PE[1] can be used for either general-purpose input or as the level- or falling edge-sensitive IRQ
interrupt input. IRQ will be enabled by setting the IRQEN configuration bit (2.3.17/119) and clearing the
I-bit in the CPU condition code register. It is inhibited at reset so this pin is initially configured as a simple
input with a pull-up.
Port E pin PE[0] can be used for either general-purpose input or as the level-sensitive XIRQ interrupt input.
XIRQ can be enabled by clearing the X-bit in the CPU condition code register. It is inhibited at reset so
this pin is initially configured as a high-impedance input with a pull-up.
Port E pins PE[5] and PE[6] are configured for reduced input threshold in certain modes (refer to
S12X_EBI section).
2.4.3.5 Port K
Port K pins PK[7:0] can be used for either general-purpose I/O, or with the external bus interface. In this
case Port K pins PK[6:0] are associated with the external address bus outputs ADDR22-ADDR16 and PK7
is associated to the EWAIT input.
Port K pin PE[7] is configured for reduced input threshold in certain modes (refer to S12X_EBI section).
2.4.3.6 Port T
This port is associated with the ECT module.
Port T pins PT[7:0] can be used for either general-purpose I/O, or with the channels of the Enhanced
Capture Timer.
2.4.3.7 Port S
This port is associated with SCI0, SCI1 and SPI0.
Port S pins PS[7:4] can be used either for general-purpose I/O, or with the SPI0 subsystem.
Port S pins PS[3:2] can be used either for general-purpose I/O, or with the SCI1 subsystem.
Port S pins PS[1:0] can be used either for general-purpose I/O, or with the SCI0 subsystem.
MC9S12XE-Family Reference Manual Rev. 1.25
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Freescale Semiconductor