JSR: Difference between revisions

Latest revision as of 00:55, 10 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Absolute	20	3 bytes	6 cycles
Absolute Indexed Indirect	FC	3 bytes	8 cycles
Absolute Long	22	4 bytes	8 cycles


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

JSR (Jump to Subroutine) is a 65x instruction that transfers control to a subroutine.

No flags are affected.

Syntax

JSR addr
JSR (addr, X)
JSR long

Execution Sequence

The return address is pushed onto the stack
Control is transferred to the target location

External Links

Eyes & Lichty, page 461 on JSR
Labiak, page 148 on JSR
8.1 on MCS6500 Manual, page 106 on JSR
Carr, page 262 on JSR
Leventhal, page 3-70 on JSR
Pickens, John. http://www.6502.org/tutorials/6502opcodes.html#JSR

@@ Line 12: / Line 12: @@
 |6 cycles
 |+
-|absolute indexed indirect
+|[[Absolute Indexed Indirect]]
 |FC
 |3 bytes
@@ Line 24: / Line 24: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!colspan="9"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|M
+|[[M Flag|M]]
-|X
+|[[X Flag|X]]
-|D
+|[[Decimal Flag|D]]
-|I
+|[[I Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |.
@@ Line 46: / Line 46: @@
 '''JSR''' (Jump to Subroutine) is a 65x instruction that transfers control to a subroutine.
+No flags are affected.
+==== Syntax ====
+<pre>
+JSR addr
+JSR (addr, X)
+JSR long
+</pre>
+==== Execution Sequence ====
+* The [[return address]] is pushed onto the stack
+* Control is transferred to the target location
 === See Also ===
 * [[JSL]]
 * [[RTS]]
+* [[RTL]]
 === External Links ===
-* [[Eyes & Lichty]] page on JSR: https://archive.org/details/0893037893ProgrammingThe65816/page/n487
+* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/461 page 461] on JSR
-* [[Labiak]] page on JSR: https://archive.org/details/Programming_the_65816/page/n158
+* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n158 page 148] on JSR
-* [[MCS6500 Manual]] page on JSR: https://archive.org/details/mos_microcomputers_programming_manual/page/n125
+* 8.1 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n125 page 106] on JSR
-* [[Carr]] page on JSR: https://archive.org/details/6502UsersManual/page/n275
+* [[Carr]], [https://archive.org/details/6502UsersManual/page/n275 page 262] on JSR
-* [[Leventhal]] page on JSR: https://archive.org/details/6502-assembly-language-programming/page/n119
+* [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n119 page 3-70] on JSR
+* Pickens, John. http://www.6502.org/tutorials/6502opcodes.html#JSR
 [[Category:ASM]]
 [[Category:Inherited from 6502]]
+[[Category:Unconditional Branches]]