MC9S12HY64 Datasheet, PDF(38/792 Page) Freescale Semiconductor, Inc – S12 Microcontrollers

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MC9S12HY64 Datasheet, PDF (38/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

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Device Overview MC9S12HY/HA-Family

1.7.3 Detailed Signal Descriptions

1.7.3.1 EXTAL, XTAL â Oscillator Pins

EXTAL and XTAL are the crystal driver and external clock pins. On reset all the device clocks are derived

from the internal reference clock. XTAL is the oscillator output.

1.7.3.2 RESET â External Reset Pin

The RESET pin is an active low bidirectional control signal. It acts as an input to initialize the MCU to a

known start-up state, and an output when an internal MCU function causes a reset. The RESET pin has an

internal pull-up device.

1.7.3.3 TEST â Test Pin

This input only pin is reserved for factory test. This pin has an internal pull-down device.

NOTE

The TEST pin must be tied to VSSA in all applications.

1.7.3.4 BKGD / MODC â Background Debug and Mode Pin

The BKGD/MODC pin is used as a pseudo-open-drain pin for the background debug communication. 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. The BKGD pin has an internal pull-up device.

1.7.3.5 PAD[7:0] / AN[7:0] / KWAD[7:0]â Port AD Input Pins of ATD [7:0]

PAD[7:0] are a general-purpose input or output pins and analog inputs AN[7:0] of the analog-to-digital

converter ATD. They can be conï¬gured as keypad wakeup inputs.

1.7.3.6 PA[7:4] / FP[36:33]â Port A I/O Pins [7:4]

PA[7:4] are a general-purpose input or output pins. They can be conï¬gured as frontplane segment driver

outputs FP[36:33].

1.7.3.7 PA[3:2] / API_EXTCLK / FP[32:31]â Port A I/O Pins [3:2]

PA[3:2] are a general-purpose input or output pins. They can be conï¬gured as frontplane segment driver

outputs FP[32:31]. PA3 can also be conï¬gure as API_EXTCLK.

1.7.3.8 PA1 / XIRQ / FP[30]â Port A I/O Pin 1

PA1 is a general-purpose input or output pin. It can be conï¬gured as frontplane segment driver outputs

FP[30]. It also provide the non-maskable interrupt request input that provides a means of applying

asynchronous interrupt requests. This will wake up the MCU from stop or wait mode. The XIRQ interrupt

MC9S12HY/HA-Family Reference Manual, Rev. 1.04

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Freescale Semiconductor

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