Serial Module Programming Model | Motorola MC68340 guide

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Freescale Semiconductor, Inc.

Address	FC	Register Read (R/W = 1)	Register Write (R/W = 0)
700	S1	MCR (HIGH BYTE)	MCR (HIGH BYTE)
701	S	MCR (LOW BYTE)	MCR (LOW BYTE)
702	S	DO NOT ACCESS3	DO NOT ACCESS3
703	S	DO NOT ACCESS3	DO NOT ACCESS3
704	S	INTERRUPT LEVEL (ILR)	NTERRUPT LEVEL (ILR)
705	S	INTERRUPT VECTOR (IVR)	INTERRUPT VECTOR (IVR)
710	S/U2	MODE REGISTER 1A (MR1A)	MODE REGISTER 1A (MR1A)
711	S/U	STATUS REGISTER A (SRA)	CLOCK-SELECT REGISTER A (CSRA)
712	S/U	DO NOT ACCESS3	COMMAND REGISTER A (CRA)
713	S/U	RECEIVER BUFFER A (RBA)	TRANSMITTER BUFFER A (TBA)
714	S/U	INPUT PORT CHANGE REGISTER (IPCR)	AUXILIARY CONTROL REGISTER (ACR)
715	S/U	INTERRUPT STATUS REGISTER (ISR)	INTERRUPT ENABLE REGISTER (IER)
716	S/U	DO NOT ACCESS3	DO NOT ACCESS3
717	S/U	DO NOT ACCESS3	DO NOT ACCESS3
718	S/U	MODE REGISTER 1B (MR1B)	MODE REGISTER 1B (MR1B)
719	S/U	STATUS REGISTER B (SRB)	CLOCK-SELECT REGISTER B (CSRB)
71A	S/U	DO NOT ACCESS3	COMMAND REGISTER B (CRB)
71B	S/U	RECEIVER BUFFER B (RBB)	TRANSMITTER BUFFER B (TBB)
71C	S/U	DO NOT ACCESS3	DO NOT ACCESS3
71D	S/U	INPUT PORT REGISTER (IP)	OUTPUT PORT CONTROL REGISTER (OPCR)
71E	S/U	DO NOT ACCESS3	OUTPUT PORT (OP)4 BIT SET
71F	S/U	DO NOT ACCESS3	OUTPUT PORT (OP)4 BIT RESET
720	S/U	MODE REGISTER 2A (MR2A)	MODE REGISTER 2A (MR2A)
721	S/U	MODE REGISTER 2B (MR2B)	MODE REGISTER 2B (MR2B)

NOTES:

1.S = Register permanently defined as supervisor-only access

2.S/U = Register programmable as either supervisor or user access

3.A read or write to these locations currently has no effect.

4.Address-triggered commands

Figure 7-9. Serial Module Programming Model

7.4.1.1MODULE CONFIGURATION REGISTER (MCR). The MCR controls the serial module configuration. This register can be either read or written when the module is enabled and is in the supervisor state. The MCR is not affected by a CPU32 RESET instruction. Only the MCR can be accessed when the module is disabled (i.e., the STP bit in the MCR is set).

MCR															$700
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
STP	FRZ1	FRZ0	ICCS	0	0	0	0	SUPV	0	0	0			IARB
RESET:
0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0
Read/Write													Supervisor Only
MOTOROLA						MC68340 USER’S MANUAL									7- 19

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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 Serial Module Programming Model

Models: MC68340

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

Address

MODE REGISTER 2B (MR2B)

Figure 7-9. Serial Module Programming Model

MCR

MC68340 specifications