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HCS12H Datasheet(PDF) 13 Page - Freescale Semiconductor, Inc |
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HCS12H Datasheet(HTML) 13 Page - Freescale Semiconductor, Inc |
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13 / 28 page  Pin Assignments 16-bit Microcontroller HCS12H Family, Rev. 11.1 Freescale Semiconductor 13 PRELIMINARY Table 2 Pin Descriptions Note: Features shown in bold are not available in the 9S12H256 112 pin QFP package. Note: Features shown in Italics are only available for the “Z” versions Pin Name Function 1 Pin Name Function 2 Pin Name Function 3 Pin Name Function 4 Description EXTAL Crystal driver and external clock input pins. On reset all the device clocks are derived from the EXTAL input frequency. XTAL is the crystal output XTAL RESET Active low bidirectional control signal that 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. TEST Test Input BKGD TAGHI MODC Function 1: Pseudo-open-drain communication pin for the background debug function. Function 2: In MCU expanded modes of operation when in- struction tagging is on, an input low on this pin during the falling edge of E-clock tags the high half of the instruction word being read into the instruction queue. Function 3: At the rising edge during reset, the state of this pin is latched to the MODC bit to set the MCU operating mode. PAD[15:8] AN[15:8] Function 1: Port AD general purpose inputs Function 2: Analog inputs (ATD) PAD[7:0] AN[7:0] KWAD[7:0] Function 1: Port AD general purpose inputs Function 2: Analog inputs (ATD) Function 3: Key wake-up input pins that can generate an inter- rupt causing the MCU to exit STOP or WAIT mode. PA[7:0] FP[15:8] ADDR[15:8]/D ATA[15:8] Function 1: Port A general purpose input or output pins. Function 2: LCD frontplane segment driver output pin. Function 3: In MCU expanded modes of operation, these pins are used for the multiplexed external address and data bus. PB[7:0] FP[7:0] ADDR[7:0]/DA TA[7:0] Function 1: Port B general purpose input or output pins. Function 2: LCD frontplane segment driver output pin. Function 3: In MCU expanded modes of operation, these pins are used for the multiplexed external address and data bus. PE7 FP22 XCLKS NOACC Function 1: Port E general purpose input or output pin Function 2: LCD frontplane segment driver output pin Function 3: The XCLKS signal selects between an external clock or oscillator configuration during reset. This pin should be at a logic high during reset if an external clock is used on the EXTAL input pin. This pin should be at a logic low during reset if an oscillator circuit is configured on EXTAL and XTAL. Since this pin is an input with a pull-down device during reset, if the pin is left floating, the default configuration is an oscillator circuit on EXTAL and XTAL. Function 4: 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. |
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Similar Description - HCS12H |
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