MC68HC12D60 Datasheet, PDF (56/432 Pages) Motorola, Inc – Advance Information - Rev 4.0

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
3.6.5 Port H
Port H pins are used for key wake-ups that can be used with the pins
configured as inputs or outputs. The key wake-ups are triggered with a
falling edge signal (KWPH). An interrupt is generated if the
corresponding bit is enabled (KWIEH). If any of the interrupts is not
enabled, the corresponding pin can be used as a general purpose I/O
pin. Refer to I/O Ports with Key Wake-up.
Register DDRH determines pin direction of Port H when used for
general-purpose I/O. When DDRH bits are set, the corresponding pin is
configured for output. On reset the DDRH bits are cleared and the
corresponding pin is configured for input.
Port PHUPD determines what type of resistive load is used for Port H
input pins when PUPH bit is set in the PUCR register. When PHUPD pin
is low, it loads a pull-down in all Port H input pins. When PHUPD pin is
high, it loads a pull-up in all Port H input pins.
In 80-pin version, the PHUPD is connected internally to VSS. The PH4
will have a pull-down. All port H pins should either be defined as outputs
or have their pull-downs enabled.
Setting the RDPH bit in register RDRIV causes all Port H outputs to have
reduced drive level. RDRIV can be written once after reset. RDRIV is not
in the address map in peripheral mode. Refer to Bus Control and
Input/Output.
3.6.6 Port CAN
The MSCAN12 uses two external pins, one input (RxCAN) and one
output (TxCAN). The TxCAN output pin represents the logic level on the
CAN: ‘0’ is for a dominant state, and ‘1’ is for a recessive state.
RxCAN is on bit 0 of Port CAN, TxCAN is on bit 1. The remaining six pins
of Port CAN, available only in the 112-pin package, are controlled by
registers in the MSCAN12 address space.
In 80QFP all PortCAN[2:7] pins should either be defined as outputs or
have their pull-ups enabled.
Advance Information
56
Pinout and Signal Descriptions
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68HC(9)12D60 — Rev 4.0
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