HCS12H FREESCALE [Freescale Semiconductor, Inc], HCS12H Datasheet - Page 13

• Manufacturer Part Number: HCS12H
• Description: 16-bit Microcontroller
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale Semiconductor
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
Function 1
PAD[15:8]
Pin Name
PAD[7:0]
RESET
PA[7:0]
PB[7:0]
EXTAL
BKGD
TEST
XTAL
PE7
Function 2
Pin Name
AN[15:8]
FP[15:8]
AN[7:0]
FP[7:0]
TAGHI
FP22




ADDR[7:0]/DA
ADDR[15:8]/D
Function 3
KWAD[7:0]
Pin Name
ATA[15:8]
XCLKS
TA[7:0]
MODC





16-bit Microcontroller HCS12H Family, Rev. 11.1
Table 2 Pin Descriptions
Function 4
Pin Name
NOACC









PRELIMINARY
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
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 Input
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.
Function 1: Port AD general purpose inputs
Function 2: Analog inputs (ATD)
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.
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.
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.
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.
Description
Pin Assignments
13