MC68HC11A0CP View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC68HC11A0CP

ROM-based high-performance microcontrollers

Freescale Semiconductor 

Freescale Semiconductor, Inc.

output port suitable for wired-OR operation. In wired-OR mode (a port C bit is at logic

level zero), it is actively driven low by the N-channel driver. When a port C bit is at logic

level one, the associated pin has high impedance, as neither the N- nor the P-channel

devices are active. It is customary to have an external pullup resistor on lines that are

driven by open-drain devices. Port C can only be configured for wired-OR operation

when the MCU is in single-chip mode. Refer to SECTION 6 PARALLEL I/O for addi-

tional information about port C functions.

2.10.4 Port D

Port D, an 8-bit, general-purpose I/O port has a data register (PORTD) and a data di-

rection register (DDRD). The eight port D bits (D[7:0]) can be used for general-purpose

I/O, for the serial communications interface (SCI) and serial peripheral interface (SPI)

subsystems, or for bus data direction control.

Port D can be read at any time and inputs return the sensed levels at the pin; whereas,

the outputs return the input level of the port D pin drivers. If PORTD is written, the data

is stored in an internal latch, and can be driven only if port D is configured for general-

purpose output. This port shares functions with the on-chip SCI and SPI subsystems,

while bits 6 and 7 control the direction of data flow on the bus in expanded and special

test modes.

Refer to SECTION 6 PARALLEL I/O.

PIN DESCRIPTIONS

2-8

TECHNICAL DATA

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