Opcr

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

7.4.1.15OUTPUT PORT CONTROL REGISTER (OPCR). The OPCR individually configures four bits of the 8-bit parallel OP for general-purpose use or as an auxiliary function serving the communication channels. This register can only be written when the serial module is enabled (i.e., the STP bit in the MCR is cleared).

OPCR							$71D
7	6	5	4	3	2	1	0
OP7	OP6	OP5	OP4	OP3	OP2	OP1	OP0
T≈RDYB T≈RDYA R≈RDYB R≈RDYA						RTSB	RTSA
RESET:
0	0	0	0	0	0	0	0
Write Only					Supervisor/User

NOTE

OP bits 7, 5, 3, and 2 are not pinned out on the MC68340; thus changing bits 7, 5, 3, and 2 of this register has no effect.

OP6—Output Port 6/ T≈RDYA

1 = The OP6/T≈RDYA pin functions as the transmitter-ready signal for channel A. The signal reflects the complement of the value of bit 2 of the SRA; thus, T≈RDYA is a logic zero when the transmitter is ready.

0 = The OP6/T≈RDYA pin functions as a dedicated output. The signal reflects the complement of the value of bit 6 of the OP.

OP4—Output Port 4/ R≈RDYA

1 = The OP4/R≈RDYA pin functions as the FIFO-full or receiver-ready signal for channel A (depending on the value of bit 6 of MR1A). The signal reflects the complement of the value of ISR bit 1; thus, R≈RDYA is a logic zero when the receiver is ready.

0 = The OP4/R≈RDYA pin functions as a dedicated output. The signal reflects the complement of the value of bit 4 of the OP.

OP1—Output Port 1/ RTSB

1 = The OP1/RTSB pin functions as the ready-to-send signal for channel B. The signal is asserted and negated according to the configuration programmed by RxRTS bit 7 in the MR1B for the receiver and TxRTS bit 5 in the MR2B for the transmitter.

0 = The OP1/RTSB pin functions as a dedicated output. The signal reflects the complement of the value of bit 1 of the OP.

7- 36MC68340 USER’S MANUALMOTOROLA

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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.

Motorola MC68340 manual Opcr

Models: MC68340

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

$71D

MC68340 specifications