Page 66 - 컴퓨터구조(프로그래밍 관점에서 바라보는)도서 미리보기

278 PART 2? 하드웨어 관점에서의 컴퓨터 구조

표 7.2? Pep/8 가상 머신의 기계어 코드 표

Instr.Spec. Operation

0000 0000 Stop execution
0000 0001 Return from trap
0000 0010 Move SP to A
0000 0011 Move NZVC flags to A
0000 010a Branch unconditional
0000 011a Branch if less than or equal to
0000 100a Branch if less than
0000 101a Branch if equal to
0000 110a Branch if not equal to
0000 111a Branch if greater than or equal to
0001 000a Branch if greater than
0001 001a Branch if V
0001 010a Branch if C
0001 011a Call subroutine
0001 100r Bitwise invert r
0001 101r Negate r
0001 110r Arithmetic shift left r
0001 111r Arithmetic shift right r
0010 000r Rotate left r
0010 001r Rotate right r
0010 01nn Unary no operation trap
0010 1aaa Nonunary no operation trap
0011 0aaa Decimal input trap
0011 1aaa Decimal output trap
0100 0aaa String output trap
0100 1aaa Character input
0101 0aaa Character output
0101 1nnn Return from call with n local bytes
0110 0aaa Add to stack pointer (SP)
0110 1aaa Subtract from stack pointer (SP)
0111 raaa Add to r
1000 raaa Subtract from r
1001 raaa Bitwise AND to r
1010 raaa Bitwise OR to r
1011 raaa Compare r
1100 raaa Load r from memory
1101 raaa Load byte from memory
1110 raaa Store r to memory
1111 raaa Store byte r to memory