HCS12H datasheet(14/28 Pages) FREESCALE

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16-bit Microcontroller HCS12H Family, Rev. 11.1

Freescale Semiconductor

PRELIMINARY

Pin Assignments

PE6

IPIPE1

MODB



Function 1: Port E general purpose input or output pins.

Function 2: Instruction queue tracking signals.

Function 3: The state of the MODA and MODB pins during

reset determine the initial operating mode of the MCU

PE5

IPIPE0

MODA



PE4

ECLK



Function 1: Port E general purpose input or output pin.

Function 2: Internal bus clock output that can be used as a tim-

ing reference.

PE3

FP21

LSTRB

TAGLO

Function 1: Port E general purpose input or output pin.

Function 2: LCD frontplane segment driver output pin.

Function 3: In MCU expanded modes of operation, LSTRB is

used for the low-byte strobe function to indicate the type of

bus access.

Function 4: When instruction tagging is on, TAGLO is used to

tag the low half of the instruction word being read into the

instruction queue.

PE2

FP20

R/W



Function 1: Port E general purpose input or output pin.

Function 2: LCD frontplane segment driver output pin.

Function 3: In MCU expanded modes of operations, performs

the read/write output signal for the external bus. This pin

indicates direction of data on the external bus.

PE1

IRQ



Function 1: Port E general purpose input pin.

Function 2: Maskable interrupt request input provides a

means of applying asynchronous interrupt requests. Will

wake up the MCU from STOP or WAIT mode

PE0

XIRQ



Function 1: Port E general purpose input pin.

Function 2: Nonmaskable interrupt request input provides a

means of applying asynchronous interrupt requests. Will

wake up the MCU from STOP or WAIT mode.

PH[7:0]

KWH[7:0]



Function 1: Port H general purpose input or output pins.

Function 2: Key wake-up input pins that can generate an

interrupt causing the MCU to exit STOP or WAIT mode.

PJ[3:0]

KWJ[3:0]



Function 1: Port J general purpose input or output pins.

Function 2: Key wake-up input pins that can generate an

interrupt causing the MCU to exit STOP or WAIT mode.

PK7

FP23

ECS

ROMCTL

Function 1: Port K general purpose input or output pin.

Function 2: LCD frontplane segment driver output pin.

Function 3: During MCU expanded modes of operation, this

pin is used to enable the Flash EEPROM memory in the

memory map.

Function 4: During MCU expanded modes of operation, this

pin is used as the emulation chip select signal.

PK[3:0]

BP[3:0]

XADDR[17:14]



Function 1: Port K general purpose input or output pins.

Function 2: LCD backplane segment driver output pins.

Function 3: In MCU expanded modes of operation, expanded

address pins for the external bus.

PL[7:4]

FP[31:28]

AN[15:12]



Function 1: Port L general purpose input or output pins.

Function 2: LCD frontplane segment driver output pins.

Function 3: Analog inputs (ATD).

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

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