S12SPIV2D datasheet(55/126 Pages) FREESCALE

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MC9S12DJ64 Device User Guide — V01.17

instruction queue. It is used as a MCU operating mode select pin during reset. The state of this pin is

latched to the MODC bit at the rising edge of RESET. This pin has a permanently enabled pull-up device.

2.3.7 PAD15 / AN15 / ETRIG1 — Port AD Input Pin of ATD1

PAD15 is a general purpose input pin and analog input AN7 of the analog to digital converter ATD1. It

can act as an external trigger input for the ATD1.

2.3.8 PAD[14:08] / AN[14:08] — Port AD Input Pins ATD1

PAD14 - PAD08 are general purpose input pins and analog inputs AN[6:0] of the analog to digital

converter ATD1.

2.3.9 PAD07 / AN07 / ETRIG0 — Port AD Input Pin of ATD0

PAD07 is a general purpose input pin and analog input AN0 of the analog to digital converter ATD0. It

can act as an external trigger input for the ATD0.

2.3.10 PAD[06:00] / AN[06:00] — Port AD Input Pins of ATD0

PAD06 - PAD00 are general purpose input pins and analog inputs AN[6:0] of the analog to digital

converter ATD0.

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

PA7-PA0 are general purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the multiplexed external address and data bus.

2.3.12 PB[7:0] / ADDR[7:0] / DATA[7:0] — Port B I/O Pins

PB7-PB0 are general purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the multiplexed external address and data bus.

2.3.13 PE7 / NOACC / XCLKS — Port E I/O Pin 7

PE7 is a general purpose input or output pin. During MCU expanded modes of operation, the NOACC

signal, when enabled, is used to indicate that the current bus cycle is an unused or “free” cycle. This signal

will assert when the CPU is not using the bus.

The XCLKS is an input signal which controls whether a crystal in combination with the internal Colpitts

(low power) oscillator is used or whether Pierce oscillator/external clock circuitry is used. The state of this

pin is latched at the rising edge of RESET. If the input is a logic low the EXTAL pin is configured for an

external clock drive or a Pierce Oscillator. If input is a logic high a Colpitts oscillator circuit is configured

on EXTAL and XTAL. Since this pin is an input with a pull-up device during reset, if the pin is left

floating, the default configuration is a Colpitts oscillator circuit on EXTAL and XTAL.

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