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XCE

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Basic Info
Addressing Mode Opcode Length Speed
Implied (type 2) FB 1 byte 2 cycles
Flags Affected
N V M X D I Z C E
. . . . . E C

XCE is a 65c816 instruction that exchanges the carry and emulation bits. It typically appears soon after the Reset Vector following a CLC, to switch the S-CPU into 65c816 native mode. The carry flag was chosen because:

  • it is easy to set and clear
  • it is used less frequently than the negative and zero flags
  • it can be tested with BCC and BCS

Syntax

XCE

Examples

Switching to native mode:

CLC
XCE

Switching to emulation mode:

SEC
XCE

xce.png

See Also

External Links