MC68HC11A0CFN2(1996) Ver la hoja de datos (PDF) - Motorola => Freescale

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Fabricante

MC68HC11A0CFN2
(Rev.:1996)

HCMOS Single-Chip Microcontroller

Motorola => Freescale 

2.1.11.1 Port A

Port A may be configured for: three input capture functions (IC1, IC2, IC3), four output

compare functions (OC2, OC3, OC4, OC5), and either a pulse accumulator input (PAI)

or a fifth output compare function (OC1). Refer to 8.1 Programmable Timer for addi-

tional information.

Any port A pin that is not used for its alternate timer function may be used as a general-

purpose input or output line.

2.1.11.2 Port B

While in single-chip operating modes, all of the port B pins are general-purpose output

pins. During MCU reads of this port, the level sensed at the input side of the port B

output drivers is read. Port B may also be used in a simple strobed output mode where

an output pulse appears at the STRB signal each time data is written to port B.

When in expanded multiplexed operating modes, all of the port B pins act as high order

address output signals. During each MCU cycle, bits 8 through 15 of the address are

output on the PB0-PB7 lines respectively.

2.1.11.3 Port C

While in single-chip operating modes, all port C pins are general-purpose input/output

pins. Port C inputs can be latched by providing an input transition to the STRA signal.

Port C may also be used in full handshake modes of parallel l/O where the STRA input

and STRB output act as handshake control lines.

When in expanded multiplexed operating modes, all port C pins are configured as mul-

tiplexed address/data signals. During the address portion of each MCU cycle, bits 0

through 7 of the address are output on the PC0-PC7 lines. During the data portion of

each MCU cycle (E high), pins 0 through 7 are bidirectional data signals (D0-D7). The

direction of data at the port C pins is indicated by the R/W signal.

2

2.1.11.4 Port D

Port D pins 0-5 may be used for general-purpose l/O signals. Port D pins alternately

serve as the serial communications interface (SCI) and serial peripheral interface

(SPI) signals when those subsystems are enabled.

Pin PD0 is the receive data input (RxD) signal for the serial communication interface

(SCI).

Pin PD1 is the transmit data output (TxD) signal for the SCI.

Pins PD2 through PD5 are dedicated to the SPI. PD2 is the master-in-slave-out (MI-

SO) signal. PD3 is the master-out-slave-in (MOSI) signal. PD4 is the serial clock

(SCK) signal and PD5 is the slave select (SS) input.

MC68HC11A8

TECHNICAL DATA

SIGNAL DESCRIPTIONS AND OPERATING MODES

MOTOROLA

2-5

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