1

A data processing apparatus, comprising:a register bank, comprising a plurality of registers respectively for storing a plurality of operands, the registers comprising a first register, the operands comprising a first operand, wherein the registers are n-bit registers, wherein n is a nature number;

a shadow register, for storing a first backup operand for making a backup of the first operand in response to a first control signal, wherein the first operand is stored in the first register; and

an operation unit, for performing at least an arithmetic operation on the operands to obtain an operational data, and storing the operational data in the first register in response to an arithmetic operation command.

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2

The data processing apparatus according to Claim 1, wherein the registers further comprises a second register, and the data processing apparatus further comprises:a logic unit, for providing the operational data of the first register to the second register in response to a second control signal, and then providing the first backup operand stored in the shadow register to the first register.

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3

The data processing apparatus according to Claim 2, wherein the logic unit further provides the operands to the arithmetic operation unit in response to a plurality of selection signals, respectively.

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4

The data processing apparatus according to Claim 2, wherein the shadow register further stores a second backup operand for making a backup of a second operand stored in the second register in response to the first control signal.

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5

The data processing apparatus according to Claim 1, wherein the arithmetic operation command is a multiply-accumulate (MLA) command, and the operation unit performs at least a multiplying-operation and at least an accumulating-operation on the operands.

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6

The data processing apparatus according to Claim 5, wherein:the registers comprises a third register and a fourth register for respectively storing a third operand and a fourth operand; and

the operation unit performs a multiplying-operation and a accumulating-operation on the first, the third, and the fourth operands to obtain the operational data and stores the operational data.

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7

A data processing method, comprising:providing a register bank comprising a plurality of registers for respectively storing a plurality of operands, wherein the registers comprises a first register, the operands comprising a first operand;

storing a first backup operand for making a backup of the first operand in response to a first control signal, wherein the first operand is stored in the first register;

performing at least an arithmetic operation on the operands to obtain an operational data in response to an arithmetic operation command; and

storing the operational data in the first register.

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8

The data processing method according to Claim 7, wherein the registers comprises a second register, and the data processing method further comprises:storing the operational data in the second register in response to a second control signal; and

storing the first backup operand in the first register.

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9

The data processing method according to Claim 7, wherein the step of storing the first backup operand for making the backup of the third operand further comprises:storing a second backup operand for making a backup of a second operand stored in the second register in response to the first control signal.

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