PER: Difference between revisions

Latest revision as of 23:00, 12 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Stack (PC Relative Long)	62	3 bytes	6 cycles


Flags Affected
N	V	M	X	D	I	Z	C
.	.	.	.	.	.	.	.

PER (Push pc RElative indirect Address) is a 65c816 instruction that pushes a 16-bit sum to the stack. The addends are:

the program counter after it has been incremented to point to the instruction following PER, and
the 16-bit displacement following the PER opcode.

The high byte of the sum is pushed before the low byte.

No flags are affected. Neither the program bank register or program counter are modified either.

PER label
PER #label

Assemblers that accept PER with the # syntax are rare.

PER works even in emulation mode.

@@ Line 40: / Line 40: @@
 The high byte of the sum is pushed before the low byte.
-No flags are affected.
+No flags are affected.  Neither the [[program bank register]] or [[program counter]] are modified either.
 ==== Syntax ====
 <pre>
 PER label
+PER #label
 </pre>
+Assemblers that accept PER with the # syntax are rare.
+PER works even in [[emulation mode]].
 === See Also ===
@@ Line 53: / Line 58: @@
 === External Links ===
-* [[Eyes & Lichty]] page 475, on PER: https://archive.org/details/0893037893ProgrammingThe65816/page/475
+* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/475 page 475] on PER
-* [[Labiak]] page 159 on PER: https://archive.org/details/Programming_the_65816/page/n169
+* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n169 page 159] on PER
 * snes9x implementation of PER: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1685
 * undisbeliever on PER: https://undisbeliever.net/snesdev/65816-opcodes.html#per-push-effective-pc-relative-indirect-address
@@ Line 61: / Line 66: @@
 [[Category:ASM]]
 [[Category:65c816 additions]]
+[[Category:Push Instructions]]
 [[Category:Three-byte Instructions]]
 [[Category:Six-cycle Instructions]]