PC912XDP512F0MFVR datasheet(57/1348 Pages) FREESCALE

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Chapter 1 Device Overview MC9S12XD-Family

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1.2.3.10

PA[7:0] / ADDR[15:8] / IVD[15:8] — Port A I/O Pins

PA[7:0] are general-purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the external address bus. In MCU emulation modes of operation, these pins are used for external

address bus and internal visibility read data.

1.2.3.11

PB[7:1] / ADDR[7:1] / IVD[7:1] — Port B I/O Pins

PB[7:1] are general-purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the external address bus. In MCU emulation modes of operation, these pins are used for external

address bus and internal visibility read data.

1.2.3.12

PB0 / ADDR0 / UDS / IVD[0] — Port B I/O Pin 0

PB0 is a general-purpose input or output pin. In MCU expanded modes of operation, this pin is used for

the external address bus ADDR0 or as upper data strobe signal. In MCU emulation modes of operation,

this pin is used for external address bus ADDR0 and internal visibility read data IVD0.

1.2.3.13

PB[7:0] — Port B I/O Pins

PB[7:0] are general-purpose input or output pins.

1.2.3.14

PC[7:0] / DATA [15:8] — Port C I/O Pins

PC[7:0] are general-purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the external data bus.

The input voltage thresholds for PC[7:0] can be conﬁgured to reduced levels, to allow data from an external

3.3-V peripheral to be read by the MCU operating at 5.0 V. The input voltage thresholds for PC[7:0] are

conﬁgured to reduced levels out of reset in expanded and emulation modes. The input voltage thresholds

for PC[7:0] are conﬁgured to 5-V levels out of reset in normal modes.

1.2.3.15

PD[7:0] / DATA [7:0] — Port D I/O Pins

PD[7:0] are general-purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the external data bus.

The input voltage thresholds for PD[7:0] can be conﬁgured to reduced levels, to allow data from an

external 3.3-V peripheral to be read by the MCU operating at 5.0 V. The input voltage thresholds for

PD[7:0] are conﬁgured to reduced levels out of reset in expanded and emulation modes. The input voltage

thresholds for PC[7:0] are conﬁgured to 5-V levels out of reset in normal modes.

1.2.3.16

PE7 / ECLKX2 / XCLKS — Port E I/O Pin 7

PE7 is a general-purpose input or output pin. The XCLKS is an input signal which controls whether a

crystal in combination with the internal loop controlled (low power) Pierce oscillator is used or whether

full swing Pierce oscillator/external clock circuitry is used.

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