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docs: Update cpu.md for new inc/dec instruction behavior

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Ry 2023-07-20 22:55:20 -07:00
parent 8dd95f2ffe
commit e9780d0a48
1 changed files with 2 additions and 2 deletions
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docs/cpu.md
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@ -118,7 +118,7 @@ data.16 0x8700 data.8 20 data.8 1
| 0x0C | ISE | none | 32 | set interrupt enable flag | 0x0C | ISE | none | 32 | set interrupt enable flag
| 0x0D | MSE | none | 32 | set MMU enable flag | 0x0D | MSE | none | 32 | set MMU enable flag
| 0x10 | HALT | none | 8/16/32 | halt CPU | 0x10 | HALT | none | 8/16/32 | halt CPU
| 0x11 | INC | src | 8/16/32 | increment (add 1) | 0x11 | INC | src | 8/16/32 | increment (add 1 << tgt in opcode encoding)
| 0x13 | OR | src+tgt | 8/16/32 | bitwise OR | 0x13 | OR | src+tgt | 8/16/32 | bitwise OR
| 0x14 | IMUL | src+tgt | 8/16/32 | multiply (signed) | 0x14 | IMUL | src+tgt | 8/16/32 | multiply (signed)
| 0x15 | SRL | src+tgt | 8/16/32 | shift right logical (with zero extension) | 0x15 | SRL | src+tgt | 8/16/32 | shift right logical (with zero extension)
@ -143,7 +143,7 @@ data.16 0x8700 data.8 20 data.8 1
| 0x2A | RET | none | 32 | return from function | 0x2A | RET | none | 32 | return from function
| 0x2C | INT | src | 32 | raise interrupt | 0x2C | INT | src | 32 | raise interrupt
| 0x2D | TLB | src | 32 | flush TLB and set page directory pointer | 0x2D | TLB | src | 32 | flush TLB and set page directory pointer
| 0x31 | DEC | src | 8/16/32 | decrement (subtract 1) | 0x31 | DEC | src | 8/16/32 | decrement (subtract 1 << tgt in opcode encoding)
| 0x32 | REM | src+tgt | 8/16/32 | calculate remainder of division (unsigned) | 0x32 | REM | src+tgt | 8/16/32 | calculate remainder of division (unsigned)
| 0x33 | NOT | src | 8/16/32 | bitwise NOT | 0x33 | NOT | src | 8/16/32 | bitwise NOT
| 0x34 | IDIV | src+tgt | 8/16/32 | divide (signed) | 0x34 | IDIV | src+tgt | 8/16/32 | divide (signed)