SC312XDP512F0MPVR datasheet(964/1348 Pages) FREESCALE

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Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

966

Freescale Semiconductor

23.0.7.4

Port E

Port E is associated with the external bus control outputs R/W, LSTRB, LDS and RE, the free-running

clock outputs ECLK and ECLK2X, as well as with the TAGHI, TAGLO, MODA and MODB 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. The clock output is always enabled in emulation modes.

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. The clock output is always enabled

in emulation modes.

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 (Section 23.0.5.14, “IRQ

Control Register (IRQCR)”) and clearing the I-bit in the CPU’s 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’s 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).

23.0.7.5

Port K

Port K pins PK[7:0] can be used for either general-purpose I/O, or, in 144-pin packages, also 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).

NOTE

Port K is not available in 80-pin packages. PK[6] is not available in 112-pin

packages.

23.0.7.6

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.

23.0.7.7

Port S

This port is associated with SCI0, SCI1 and SPI0. Port S pins PS[7:0] can be used either for general-

purpose I/O, or with the SCI and SPI subsystems.

The SPI0 pins can be re-routed. Refer to Section 23.0.5.37, “Module Routing Register (MODRR)”.

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