PMx and PT Control Bits, Parity Mode Parity Type

Freescale Semiconductor, Inc.

ERR—Error Mode

This bit controls the meaning of the three FIFO status bits (RB, FE, and PE) in the SR for the channel.

1 = Block mode—The values in the channel SR are the accumulation (i.e., the logical OR) of the status for all characters coming to the top of the FIFO since the last reset error status command for the channel was issued. Refer to 7.4.1.7 Command Register (CR) for more information on serial module commands.

0 = Character mode—The values in the channel SR reflect the status of the character at the top of the FIFO.

NOTE

ERR = 0 must be used to get the correct A/D flag information when in multidrop mode.

PM1–PM0—Parity Mode

These bits encode the type of parity used for the channel (see Table 7-2). The parity bit is added to the transmitted character, and the receiver performs a parity check on incoming data. These bits can alternatively select multidrop mode for the channel.

PT—Parity Type

This bit selects the parity type if parity is programmed by the parity mode bits, and if multidrop mode is selected, it configures the transmitter for data character transmission or address character transmission. Table 7-2 lists the parity mode and type or the multidrop mode for each combination of the parity mode and the parity type bits.

Table 7-2. PMx and PT Control Bits

PM1	PM0	Parity Mode	PT	Parity Type
0	0	With Parity	0	Even Parity
0	0	With Parity	1	Odd Parity
0	1	Force Parity	0	Low Parity
0	1	Force Parity	1	High Parity
1	0	No Parity	X	No Parity
1	1	Multidrop Mode	0	Data Character
1	1	Multidrop Mode	1	Address Character

B/C1–B/C0—Bits per Character

These bits select the number of data bits per character to be transmitted. The character length listed in Table 7-3 does not include start, parity, or stop bits.

MOTOROLAMC68340 USER’S MANUAL7- 23

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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 PMx and PT Control Bits, Parity Mode Parity Type

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Table 7-2. PMx and PT Control Bits

Parity Mode

Parity Type

MOTOROLAMC68340 USER’S MANUAL7- 23

MC68340 specifications