TCALL (SPC700): Difference between revisions

Revision as of 17:29, 24 July 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Implied (type 3)	01	1 byte	8 cycles
Implied (type 3)	11	1 byte	8 cycles
Implied (type 3)	21	1 byte	8 cycles
Implied (type 3)	31	1 byte	8 cycles
Implied (type 3)	41	1 byte	8 cycles
Implied (type 3)	51	1 byte	8 cycles
Implied (type 3)	61	1 byte	8 cycles
Implied (type 3)	71	1 byte	8 cycles
Implied (type 3)	81	1 byte	8 cycles
Implied (type 3)	91	1 byte	8 cycles
Implied (type 3)	A1	1 byte	8 cycles
Implied (type 3)	B1	1 byte	8 cycles
Implied (type 3)	C1	1 byte	8 cycles
Implied (type 3)	D1	1 byte	8 cycles
Implied (type 3)	E1	1 byte	8 cycles
Implied (type 3)	F1	1 byte	8 cycles


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.

External Links

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

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 |}
-'''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.  The high byte of the effective address is always $FF.
+'''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.
 === See Also ===