We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
TCALL (SPC700): Difference between revisions
From SnesLab
(→External Links: fix broken link) |
(→See Also: RET) |
||
Line 142: | Line 142: | ||
* [[CALL]] | * [[CALL]] | ||
* [[PCALL]] | * [[PCALL]] | ||
* [[RET]] | |||
=== External Links === | === External Links === |
Revision as of 17:35, 8 August 2024
Basic Info | |||||||
---|---|---|---|---|---|---|---|
Addressing Mode | Opcode | Length | Speed | Vector 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 whose address is stored in the uppermost page. The low byte of the address of the vector (pointer to subroutine) is a function of the high nybble of the opcode, equal to $DE - n*2. The high byte of the vector address is always $FF.
No flags are affected.
Syntax
TCALL n
where n is the vector call number, a decimal integer from 0 to 15, which becomes the high nybble of the opcode.
See Also
External Links
- Official Nintendo documentation on TCALL: Table C-16 Appendix C-9
- anomie's SPC700 doc
- https://forums.nesdev.org/viewtopic.php?t=13313