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5.3.3.7BINARY-CODED DECIMAL (BCD) INSTRUCTIONS. Five instructions support operations on BCD numbers. The arithmetic operations on packed BCD numbers are add decimal with extend (ABCD), subtract decimal with extend (SBCD), and negate decimal with extend (NBCD). Table 5-9 is a summary of the BCD operations.

Table 5-9. Binary-Coded Decimal Operations

 

Operand

 

 

Instruction

Syntax

Operand Size

Operation

ABCD

Dn, Dn

8

Source 10 + Destination10 + X ⇒ Destination

 

– (An), – (An)

8

 

NBCD

〈ea〉

8

0 – Destination10 – X ⇒ Destination

 

 

8

 

SBCD

Dn, Dn

8

Destination10 – Source10 – X ⇒ Destination

 

– (An), – (An)

8

 

5.3.3.8PROGRAM CONTROL INSTRUCTIONS. A set of subroutine call and return instructions and conditional and unconditional branch instructions perform program control operations. Table 5-10 summarizes these instructions.

Table 5-10. Program Control Operations

 

Operand

 

 

Instruction

Syntax

Operand Size

Operation

 

 

Conditional

Bcc

〈label〉

8, 16, 32

If condition true, then PC + d ⇒ PC

DBcc

Dn , 〈label〉

16

If condition false, then Dn – 1 ⇒ PC;

 

 

 

if Dn ≠ (– 1), then PC + d ⇒ PC

Scc

〈ea〉

8

If condition true, then destination bits are set to 1;

 

 

 

else destination bits are cleared to 0

 

 

Unconditional

BRA

〈label〉

8, 16, 32

PC + d ⇒ PC

BSR

〈label〉

8, 16, 32

SP – 4 ⇒ SP; PC ⇒ (SP); PC + d ⇒ PC

JMP

〈ea〉

none

Destination ⇒ PC

JSR

〈ea〉

none

SP – 4 ⇒ SP; PC ⇒ (SP); destination ⇒ PC

NOP

none

none

PC + 2 ⇒ PC

 

 

 

Returns

RTD

#〈d〉

16

(SP) ⇒ PC; SP + 4 + d ⇒ SP

RTR

none

none

(SP) ⇒ CCR; SP + 2 ⇒ SP; (SP) ⇒ PC; SP + 4 ⇒

 

 

 

SP

RTS

none

none

(SP) ⇒ PC; SP + 4 ⇒ SP

5- 26MC68340 USER’S MANUALMOTOROLA

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Motorola MC68340 manual Binary-Coded Decimal Operations, Program Control Operations, Conditional, Unconditional, Returns
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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.
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