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| author | Jan Tuomi <jan@jantuomi.fi> | 2024-04-26 15:40:14 +0300 |
|---|---|---|
| committer | Jan Tuomi <jan@jantuomi.fi> | 2024-04-26 15:40:14 +0300 |
| commit | 7ca56c1a730fcecd0fe3af5e6b652fa09514a18b (patch) | |
| tree | e2ef6a4d28fa26adf11e00d138ef21b8316497f6 /16bit-cpu.md | |
| parent | 2b18b320e97260f1d27143a37fe14953cf62e56d (diff) | |
Refactor project structure, add README and LICENSE
Diffstat (limited to '16bit-cpu.md')
| -rw-r--r-- | 16bit-cpu.md | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/16bit-cpu.md b/16bit-cpu.md deleted file mode 100644 index d862114..0000000 --- a/16bit-cpu.md +++ /dev/null @@ -1,33 +0,0 @@ -# 16-bit CPU design doc - -## Features -16-bit data -16-bit address width -16-bit instruction width -16-bit control word -Minimal instruction set computer (MISC) -4-bit opcodes -Memory mapped I/O - -instruction format -xxxx xxxx xxxx xxxx - xxxx xxxx xxxx xxxx - -General purpose registers: - - RA (0) .. RH (7) - -Expansion port that connects directly to the main bus - -Default addressing mode: indirect absolute (addresses are stored in registers and point to a complete address). Some instructions use PC-relative addressing. - -## Operations - -TODO rewrite bit about operations - -ALU flags: -- C = carry bit -- O = overflow bit -- Z = zero bit -- S = sign bit - -Interrupt lines: ??? |