mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 897

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

19.4.3.1
The BKGD pin is associated with the S12X_BDM and S12X_EBI modules.
During reset, the BKGD pin is used as MODC input.
19.4.3.2
Port A pins PA[7:0] and Port B pins PB[7:0] can be used for either general-purpose I/O with the external
bus interface. In this case Port A and Port B are associated with the external address bus outputs ADDR15-
ADDR8 and ADDR7-ADDR0, respectively. PB0 is the ADDR0 or UDS output.
19.4.3.3
Port C pins PC[7:0] and Port D pins PD[7:0] can be used for either general-purpose I/O with the external
bus interface. In this case Port C and Port D are associated with the external data bus inputs/outputs
DATA15-DATA8 and DATA7-DATA0, respectively.
These pins are configured for reduced input threshold in certain operating modes (refer to S12X_EBI
Block Guide).
19.4.3.4
Port E is associated with the external bus control outputs RW, 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[6] an be used for either general-purpose I/O, as TAGHI input or as MODB input during reset.
Port E pin PE[5] an be used for either general-purpose I/O, as TAGLO input, RE output or as MODB input
during reset.
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[3] an be used for either general-purpose I/O, as LSTRB or LDS output, or as EROMCTL
input during reset.
Port E pin PE[2] an be used for either general-purpose I/O, or as RW or RE 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 (19.3.17/19-859) and clearing
Freescale Semiconductor
BKGD pin
Port A, B
Port C, D
Port E
MC9S12XF - Family Reference Manual, Rev.1.19
Chapter 19 Port Integration Module (S12XFPIMV2)
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