XC2000 datasheet(35/647 Pages) INFINEON

35 / 647 page

XC2000 Derivatives

System Units (Vol. 1 of 2)

Architectural Overview

Preliminary

User’s Manual

2-7

V1.0, 2007-06

ArchitectureX2K, V1.0

2.1.4

Consistent and Optimized Instruction Formats

To obtain optimum performance in a pipelined design, an instruction set has been

designed which incorporates concepts from Reduced Instruction Set Computing (RISC).

These concepts primarily allow fast decoding of the instructions and operands while

reducing pipeline holds. These concepts, however, do not preclude the use of complex

instructions required by microcontroller users. The instruction set was designed to meet

the following goals:

• Provide powerful instructions for frequently-performed operations which traditionally

have required sequences of instructions. Avoid transfer into and out of temporary

registers such as accumulators and carry bits. Perform tasks in parallel such as saving

state upon entry into interrupt routines or subroutines.

• Avoid complex encoding schemes by placing operands in consistent fields for each

instruction and avoid complex addressing modes which are not frequently used.

Consequently, the instruction decode time decreases and the development of

compilers and assemblers is simplified.

• Provide most frequently used instructions with one-word instruction formats. All other

instructions use two-word formats. This allows all instructions to be placed on word

boundaries: this alleviates the need for complex alignment hardware. It also has the

benefit of increasing the range for relative branching instructions.

The high performance of the CPU-hardware can be utilized efficiently by a programmer

by means of the highly functional XC2000 instruction set which includes the following

instruction classes:

• Arithmetic Instructions

• DSP Instructions

• Logical Instructions

• Boolean Bit Manipulation Instructions

• Compare and Loop Control Instructions

• Shift and Rotate Instructions

• Prioritize Instruction

• Data Movement Instructions

• System Stack Instructions

• Jump and Call Instructions

• Return Instructions

• System Control Instructions

• Miscellaneous Instructions

Possible operand types are bits, bytes, words, and doublewords. Specific instructions

support the conversion (extension) of bytes to words. Various direct, indirect, and

immediate addressing modes are provided to specify the required operands.

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