Condition decision circuit for a microcomputer
First Claim
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1. A microcomputer, comprising:
- a condition decision circuit, having;
a register group including a plurality of registers, one of which is specified by execution of a conditional branch instruction, and to which a predetermined value in the code of said conditional branch instructions is set;
a comparing register which stores the operation result of the instruction execution;
compare means for comparing a value of the register specified by the conditional branch instruction in said registers group and a value of said compare register bit by bit; and
a mask register which, by masking values of only necessary bits of the register specified by the conditional branch instruction in said register group, forces a condition decision signal, representing whether or not the branch condition of the conditional branch instruction is satisfied, to a state representing that the branch condition is satisfied.
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Abstract
A high-speed microcomputer having a condition decision circuit in which a signal output indicating whether or not a branch condition is satisfied is always active by taking out only a necessary bit by a mask register value after comparing a register value and a compare register value for every bit.
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5 Claims
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1. A microcomputer, comprising:
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a condition decision circuit, having; a register group including a plurality of registers, one of which is specified by execution of a conditional branch instruction, and to which a predetermined value in the code of said conditional branch instructions is set; a comparing register which stores the operation result of the instruction execution; compare means for comparing a value of the register specified by the conditional branch instruction in said registers group and a value of said compare register bit by bit; and a mask register which, by masking values of only necessary bits of the register specified by the conditional branch instruction in said register group, forces a condition decision signal, representing whether or not the branch condition of the conditional branch instruction is satisfied, to a state representing that the branch condition is satisfied. - View Dependent Claims (2, 3, 4, 5)
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Specification