Motorola MC68340 manual Serial Module Example Configuration Code, Serial EQU, Mcrh EQU, Mcrl EQU

Models: MC68340

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

The following steps are channel specific:

Clock Select Register (CSR)

• Select the receiver and transmitter clock.

Mode Register 1 (MR1)

If desired, program operation of receiver ready-to-send (RxRTS bit).

Select receiver-ready or FIFO-full notification (R/F bit).

Select character or block error mode (ERR bit).

Select parity mode and type (PM and PT bits).

Select number of bits per character (B/Cx bits).

Mode Register 2 (MR2)

Select the mode of channel operation (CMx bits).

If desired, program operation of transmitter ready-to-send (TxRTS bit).

If desired, program operation of clear-to-send (TxCTS bit).

Select stop-bit length (SBx bits).

Command Register (CR)

• Enable the receiver and transmitter.

7.5.2 Serial Module Example Configuration Code

The following code is an example of a configuration sequence for the serial module.

***************************************************************************

*MC68340 basic serial module register initialization example code.

*This code is used to initialize the 68340's internal serial module registers,

*providing basic functions for operation.

*It sets up serial channel A for communication with a 9600 baud terminal.

*Note: All serial module registers must be accessed as bytes.

***************************************************************************

***************************************************************************

*equates

***************************************************************************

MBAR

EQU

$0003FF00

Address of SIM40 Module Base Address Reg.

MODBASE

EQU

$FFFFF000

SIM40 MBAR address value

***************************************************************

* Serial module equates

 

SERIAL

EQU

$700

Offset from MBAR for serial module regs

MCRH

EQU

$0

serial MCR high byte

MCRL

EQU

$1

serial MCR low byte

MOTOROLAMC68340 USER’S MANUAL7- 47

For More Information On This Product,

Go to: www.freescale.com

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Motorola MC68340 manual Serial Module Example Configuration Code, Serial EQU, Mcrh EQU, Mcrl EQU

MC68340 specifications

The Motorola MC68340 is a highly integrated microprocessor that was introduced in the early 1990s. It belongs to the 68000 family of microprocessors and is designed to cater to the demands of embedded systems, particularly in telecommunications and networking applications. This chip represents a significant evolution in microprocessor technology by combining a microprocessor core with additional peripherals on a single chip, making it an attractive solution for engineers looking to design compact and efficient systems.

One of the key features of the MC68340 is its 32-bit architecture, which allows for significant processing power and data handling capabilities. This architecture enables the processor to handle larger data sizes and perform more complex calculations compared to its 16-bit predecessors. The MC68340 operates at clock speeds typically ranging from 16 MHz to 25 MHz. Its dual instruction pipeline enhances throughput, allowing for simultaneous instruction fetches and executions, which significantly boosts performance.

A notable characteristic of the MC68340 is the inclusion of integrated peripherals, which help reduce the overall component count in a system. Key integrated components include a memory management unit (MMU), a direct memory access (DMA) controller, and various communication interfaces such as serial ports. The memory management capabilities enhance the processor's ability to manage memory resources efficiently, enabling it to support multitasking environments commonly found in modern computing.

In terms of connectivity, the MC68340 features connections for both synchronous and asynchronous serial communication, making it well-suited for networking tasks. The processor supports a range of bus standards, including address and data buses, which facilitate seamless interaction with peripheral devices.

Another important aspect of the MC68340 is its flexibility. The processor supports multiple operating modes, including multiple CPU configurations and compatibility with the Motorola 68000 family, allowing for easier integration into existing systems.

Moreover, the MC68340 boasts low power consumption compared to many of its contemporaries, making it an excellent choice for battery-operated applications, enhancing its appeal in sectors like telecommunications, industrial control, and automotive systems. Its combination of performance, integration, versatility, and efficiency has secured the MC68340 a reputable position in the annals of embedded systems technology, proving to be a valuable asset for developers and engineers alike.