Mbar | Motorola MC68340 specification

Freescale Semiconductor, Inc.

4.3.1 Module Base Address Register (MBAR)

MBAR 1														$0003FF00
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
BA31	BA30	BA29	BA28	BA27	BA26	BA25	BA24	BA23	BA22	BA21	BA20	BA19	IBA18	BA17	BA16
RESET:
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
													CPU Space Only
MBAR 2														$0003FF02
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
BA15	BA14	BA13	BA12	0	0	AS8	AS7	AS6	AS5	AS4	AS3	AS2	AS1	AS0	V
RESET
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

CPU Space Only

BA31–BA12—Base Address Bits 31–12

The base address field is the upper 20 bits of the MBAR that provides for block starting locations in increments of 4-Kbytes.

Bits 11, 10—Reserved

AS8–AS0—Address Space Bits 8–0

The address space field allows particular address spaces to be masked, placing the 4K module block into a particular address space(s). If an address space is masked, an access to the register block location in that address space becomes an external access. The module block is not accessed. The address space bits are as follows:

AS8—mask DMA Space	address space (FC3–FC0 = 1xxx)
AS7—mask CPU Space	address space (FC3–FC0 = 0111)
AS6—mask Supervisor Program	address space (FC3–FC0 = 0110)
AS5—mask Supervisor Data	address space (FC3–FC0 = 0101)
AS4—mask Reserved [Motorola]	address space (FC3–FC0 = 0100)
AS3—mask Reserved [User]	address space (FC3–FC0 = 0011)
AS2—mask User Program	address space (FC3–FC0 = 0010)
AS1—mask User Data	address space (FC3–FC0 = 0001)
AS0—mask Reserved [Motorola]	address space (FC3–FC0 = 0000)

For each address space bit:

1 = Mask this address space from the internal module selection. The bus cycle goes external.

0 = Decode for the internal module block.

V—Valid Bit

This bit indicates when the contents of the MBAR are valid. The base address value is not used; therefore, all internal module registers are not accessible until the V-bit is set.

1 =	Contents are valid.
0 =	Contents are not valid.
4- 20	MC68340 USER’S MANUAL	MOTOROLA
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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 Mbar

Models: MC68340

Freescale Semiconductor, Inc.

MBAR 1

MBAR 2

MC68340 specifications