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TCALL (SPC700): Difference between revisions

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(no flags affected)
(→‎Syntax: vector call number)
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where n is decimal integer from 0 to 15, which becomes the high nibble of the opcode.
where n is the vector call number, a decimal integer from 0 to 15, which becomes the high nibble of the opcode.


=== See Also ===
=== See Also ===

Revision as of 04:44, 8 July 2024

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.

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 nibble of the opcode.

See Also

External Links