Add parity bit update each instruction cycle

[emu8051.git] / src / cpu8051.c

diff --git a/src/cpu8051.c b/src/cpu8051.c
index 58a0e79..55e761a 100644 (file)
--- a/src/cpu8051.c
+++ b/src/cpu8051.c
@@ -28,6 +28,7 @@
 #include "reg8051.h"
 #include "cpu8051.h"
 #include "memory.h"
+#include "psw.h"
 #include "disasm.h"
 #include "instructions_8051.h"
 
@@ -374,6 +375,12 @@ cpu8051_Exec(void)
        cpu8051.pc++;
        insttiming = (*opcode_table[opcode])(); /* Function callback. */
 
+       /*
+        * Parity bit (p): is automatically set or cleared in each machine
+        * cycle to establish even parity in the accumulator.
+        */
+       psw_compute_parity_bit();
+
        for (i = 0; i < insttiming; i++) {
                cpu8051_CheckInterrupts();
                cpu8051_DoTimers();