JSR - Revision history

Mr z: Protected "JSR" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T08:08:24Z

Protected "JSR" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Mr z at 21:56, 7 October 2007

2007-10-07T21:56:31Z

Mr z at 07:59, 7 October 2007

2007-10-07T07:59:28Z

Pingaso at 21:29, 11 January 2005

2005-01-11T21:29:30Z

Pingaso at 20:37, 11 January 2005

2005-01-11T20:37:15Z

Pingaso at 20:35, 11 January 2005

2005-01-11T20:35:45Z

New page

The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes. The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters. 

Format - Decle #1 Format - Decle #2 Format - Decle #3
0000:0000:0000:0100 0000:00rr:aaaa:aa00 0000:00aa:aaaa:aaaa 
where: 
rr indicates the register into which to store the return address
such that:
rr == 00 indicates to store return address in register R4
rr == 01 indicates register R5
rr == 10 indicates register R6
rr == 11 indicates that the [[CP1610]] should not store the
return address, signaling an [[J|Unconditional Jump]]
rather than a Jump to Subrouting (JSR) 
aaaaaaaaaaaaaaaa indicates the address to where the [[CP1610]] should Jump

Note that if the address stored in the specified register is the address that is exactly 3 addresses after the start of the Jump to Subroutine opcode, so that the subroutine will return to the next opcode immediately following Jump opcode. 

See the [[Jump]] opcode family documentation for more information.

@@ Line 7: / Line 7: @@
 <tr><td>Opcode Range</td><td>$0004</td></tr>
 </table><br/>
-The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes.  The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.  The instruction <TT>CALL <I>label</I></TT> is an alias for <TT>JSR R5, <I>label</I></TT>.<br/>
+The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes.  The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.<br/><br/>
      Format - Decle #1     Format - Decle #2     Format - Decle #3

@@ Line 7: / Line 7: @@
 <tr><td>Opcode Range</td><td>$0004</td></tr>
 </table><br/>
-The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes.  The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.<br/>
+The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes.  The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.  The instruction <TT>CALL <I>label</I></TT> is an alias for <TT>JSR R5, <I>label</I></TT>.<br/>
      Format - Decle #1     Format - Decle #2     Format - Decle #3

← Older revision		Revision as of 21:29, 11 January 2005
Line 1:		Line 1:
		+	[[Category:CP1610]]
		+	<table border>
		+	<tr><td>Instruction Name</td><td>Jump to Subroutine</td></tr>
		+	<tr><td>Mnemonics</td><td>JSR</td></tr>
		+	<tr><td>CP1610 Clock Cycles</td><td>12</td></tr>
		+	<tr><td>Interruptible</td><td>Yes</td></tr>
		+	<tr><td>Opcode Range</td><td>$0004</td></tr>
		+	</table><br/>
	The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes. The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.<br/>		The Jump to Subroutine opcode (JSR) is a three-decle opcode that is a part of the [[Jump]] family of opcodes. The Jump to Subroutine causes the [[CP1610]] to store the return address in the register specified, and then unconditionally jump to the address specified in the following parameters.<br/>

@@ Line 14: / Line 14: @@
          aaaaaaaaaaaaaaaa    indicates the address to where the [[CP1610]] should Jump
-Note that if the address stored in the specified register is the address that is exactly 3 addresses after the start of the Jump to Subroutine opcode, so that the subroutine will return to the next opcode immediately following Jump opcode.<br/>
+Note that if the address stored in the specified register is the address that is exactly 3 addresses after the start of the Jump opcode, so that the subroutine will return to the next opcode immediately following Jump opcode.<br/>
 See the [[Jump]] opcode family documentation for more information.

← Older revision	Revision as of 08:08, 4 December 2010
(No difference)