We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
JSR: Difference between revisions
From SnesLab
(added Leventhal page) |
(→External Links: added name to ref) |
||
| (24 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
{| class="wikitable" style="float:right;clear:right;width:40%" | |||
{| class="wikitable" style="width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
| Line 9: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|20 | |20 | ||
|3 bytes | |3 bytes | ||
|6 cycles | |6 cycles | ||
|+ | |+ | ||
| | |[[Absolute Indexed Indirect]] | ||
|FC | |FC | ||
|3 bytes | |3 bytes | ||
|8 cycles | |8 cycles | ||
|+ | |+ | ||
| | |[[Absolute Long Addressing | Absolute Long]] | ||
|22 | |22 | ||
|4 bytes | |4 bytes | ||
| Line 26: | Line 24: | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !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 44: | ||
|. | |. | ||
|} | |} | ||
'''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 === | === See Also === | ||
* [[JSL]] | * [[JSL]] | ||
* [[RTS]] | |||
* [[RTL]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/461 page 461] on JSR | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n158 page 148] on JSR | ||
* [[MCS6500 Manual]] | * 8.1 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n125 page 106] on JSR | ||
* [[Carr]] | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n275 page 262] on JSR | ||
* [[Leventhal]] | * [[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:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:Unconditional Branches]] | |||
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
See Also
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