TCALL (SPC700): Difference between revisions

Latest revision as of 12:06, 28 November 2023


Basic Info
Addressing Mode	Opcode	Length	Speed	Target Address
Implied (type 3)	01	1 byte	8 cycles	$FFDE
Implied (type 3)	11	1 byte	8 cycles	$FFDC
Implied (type 3)	21	1 byte	8 cycles	$FFDA
Implied (type 3)	31	1 byte	8 cycles	$FFD8
Implied (type 3)	41	1 byte	8 cycles	$FFD6
Implied (type 3)	51	1 byte	8 cycles	$FFD4
Implied (type 3)	61	1 byte	8 cycles	$FFD2
Implied (type 3)	71	1 byte	8 cycles	$FFD0
Implied (type 3)	81	1 byte	8 cycles	$FFCE
Implied (type 3)	91	1 byte	8 cycles	$FFCC
Implied (type 3)	A1	1 byte	8 cycles	$FFCA
Implied (type 3)	B1	1 byte	8 cycles	$FFC8
Implied (type 3)	C1	1 byte	8 cycles	$FFC6
Implied (type 3)	D1	1 byte	8 cycles	$FFC4
Implied (type 3)	E1	1 byte	8 cycles	$FFC2
Implied (type 3)	F1	1 byte	8 cycles	$FFC0


Flags Affected
N	V	P	B	H	I	Z	C
.	.	.	.	.	.	.	.

TCALL (Table CALl) is an SPC700 instruction that calls a subroutine in the uppermost page. The low byte of the effective address which is called is a function of the high nibble of the opcode, equal to $DE - nibble*2. The high byte of the effective address is always $FF.

Syntax

TCALL n

where n is decimal integer from 0 to 15, which becomes the high nibble of the opcode.

External Links

Official Nintendo documentation on TCALL: Table C-16 Appendix C-9
anomie's SPC700 doc

@@ Line 1: / Line 1: @@
-'''TCALL''' (Table CALl) is an [[SPC700]] instruction.
+{| class="wikitable" style="float:right;clear:right;width:40%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 8: / Line 6: @@
 |'''Length'''
 |'''Speed'''
+|'''Target Address'''
+|+
+|[[Implied]] (type 3)
+|01
+|1 byte
+|8 cycles
+|$FFDE
+|+
+|[[Implied]] (type 3)
+|11
+|1 byte
+|8 cycles
+|$FFDC
+|+
+|[[Implied]] (type 3)
+|21
+|1 byte
+|8 cycles
+|$FFDA
+|+
+|[[Implied]] (type 3)
+|31
+|1 byte
+|8 cycles
+|$FFD8
+|+
+|[[Implied]] (type 3)
+|41
+|1 byte
+|8 cycles
+|$FFD6
+|+
+|[[Implied]] (type 3)
+|51
+|1 byte
+|8 cycles
+|$FFD4
+|+
+|[[Implied]] (type 3)
+|61
+|1 byte
+|8 cycles
+|$FFD2
+|+
+|[[Implied]] (type 3)
+|71
+|1 byte
+|8 cycles
+|$FFD0
+|+
+|[[Implied]] (type 3)
+|81
+|1 byte
+|8 cycles
+|$FFCE
+|+
+|[[Implied]] (type 3)
+|91
+|1 byte
+|8 cycles
+|$FFCC
+|+
+|[[Implied]] (type 3)
+|A1
+|1 byte
+|8 cycles
+|$FFCA
+|+
+|[[Implied]] (type 3)
+|B1
+|1 byte
+|8 cycles
+|$FFC8
+|+
+|[[Implied]] (type 3)
+|C1
+|1 byte
+|8 cycles
+|$FFC6
 |+
-|implied
+|[[Implied]] (type 3)
-|n1
+|D1
 |1 byte
 |8 cycles
+|$FFC4
+|+
+|[[Implied]] (type 3)
+|E1
+|1 byte
+|8 cycles
+|$FFC2
+|+
+|[[Implied]] (type 3)
+|F1
+|1 byte
+|8 cycles
+|$FFC0
 |}
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="8"|Flags Clobbered
+!colspan="8"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|P
+|[[Direct Page Flag|P]]
-|B
+|[[Break Flag|B]]
-|H
+|[[Half-Carry Flag|H]]
-|I
+|[[Interrupt Enable Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |.
@@ Line 36: / Line 126: @@
 |.
 |}
+'''TCALL''' (Table CALl) is an [[SPC700]] instruction that calls a subroutine in the [[uppermost page]].  The low byte of the effective address which is called is a function of the high nibble of the opcode, equal to $DE - nibble*2.  The high byte of the effective address is always $FF.
+=== Syntax ===
+<pre>
+TCALL n
+</pre>
+where n is decimal integer from 0 to 15, which becomes the high nibble of the opcode.
 === See Also ===
 * [[CALL]]
 * [[PCALL]]
+=== External Links ===
+* Official Nintendo documentation on TCALL: Table C-16 [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9]
+* [https://www.romhacking.net/documents/197| anomie's SPC700 doc]
 [[Category:ASM]]
 [[Category:SPC700]]
+[[Category:Subroutine Call Return Commands]]
+[[Category:One-byte Instructions]]