From e01ae3e0a046b60d1b1d89bd448ca930b9790d29 Mon Sep 17 00:00:00 2001
From: Uri Shaked
Date: Tue, 19 Nov 2019 17:12:55 +0200
Subject: feat: implement STX

---
 src/instruction.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'src/instruction.ts')

diff --git a/src/instruction.ts b/src/instruction.ts
index f7789d2..63c4caa 100644
--- a/src/instruction.ts
+++ b/src/instruction.ts
@@ -425,7 +425,7 @@ export function avrInstruction(cpu: ICPU) {
 
   /* STX */
   if ((opcode & 0xfe0f) === 0x920c) {
-    /* not implemented */
+    cpu.writeData(cpu.dataView.getUint16(26, true), cpu.data[(opcode & 0x1f0) >> 4]);
   }
 
   /* STX */
@@ -436,7 +436,10 @@ export function avrInstruction(cpu: ICPU) {
 
   /* STX */
   if ((opcode & 0xfe0f) === 0x920e) {
-    /* not implemented */
+    const i = cpu.data[(opcode & 0x1f0) >> 4];
+    cpu.dataView.setUint16(26, cpu.dataView.getUint16(26, true) - 1, true);
+    cpu.writeData(cpu.dataView.getUint16(26, true), i);
+    cpu.cycles++;
   }
 
   /* STY */
-- 
cgit v1.2.3