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executing at completion of the bus cycle. PCC will contain $00000001 if BDM is entered via a double bus fault immediately out of reset.

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CPU32 ACTIVITY

ENTER (BDM)

•ASSERT FREEZE SIGNAL

•WAIT FOR COMMAND

EXECUTE COMMAND

•LOAD: NOT READY/ RESPONSE

•PERFORM COMMAND

•STORE RESULTS

DEVELOPMENT.SYSTEM ACTIVITY

SEND INITIAL COMMAND

•LOAD COMMAND REGISTER

•ENABLE SHIFT CLOCK

•SHIFT OUT 17 BITS

•DISABLE SHIFT CLOCK

READ RESULTS/NEW COMMAND

• LOAD COMMAND REGISTER

• ENABLE SHIFT CLOCK

•SHIFT IN/OUT 17 BITS

•DISABLE SHIFT CLOCK

•READ RESULT REGISTER

IF RESULTS =	YES
"NOT READY"

CONTINUE

Figure 5-21. BDM Command Execution Flowchart

5.6.2.6RETURNING FROM BDM. BDM is terminated when a resume execution (GO) or call user code (CALL) command is received. Both GO and CALL flush the instruction pipeline and prefetch instructions from the location pointed to by the RPC.

The return PC and the memory space referred to by the SR SUPV bit reflect any changes made during BDM. FREEZE is negated prior to initiating the first prefetch. Upon negation of FREEZE, the serial subsystem is disabled, and the signals revert to IPIPE and IFETCH functionality.

5.6.2.7SERIAL INTERFACE. Communication with the CPU32 during BDM occurs via a dedicated serial interface, which shares pins with other development features. The BKPT signal becomes the DSCLK; DSI is received on IFETCH, and DSO is transmitted on

IPIPE.

5- 68MC68340 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 Freescale

Models: MC68340