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MC912XDP512F0MFU Datasheet(PDF) 57 Page - Freescale Semiconductor, Inc |
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MC912XDP512F0MFU Datasheet(HTML) 57 Page - Freescale Semiconductor, Inc |
57 / 1350 page Chapter 1 Device Overview MC9S12XD-Family MC9S12XDP512 Data Sheet, Rev. 2.17 Freescale Semiconductor 57 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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