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Individual Instruction Descriptions
4-182
4.14.84 VCALL Vectored Call
Syntax
[label] name dest Clock, clk Word, w With RPT, clk Class
VCALL vector8 2 1 N/R 7a
Execution Push PC + 1
PC ⇐ *(0x7F00 + vector8)
R7 ⇐ R7 + 2
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
VCALL vector8 1 1 1 1 1 1 1 0 1 vector8
Description Unconditional vectored call (Macro call). Push next address onto stack, load
PC with the content of the address obtained by adding vector8 to 0x7F00. The
execution of the instruction continues from the new PC location. RET
instruction is used to return from VCALL. RET cannot immediately follow
VCALL. IRET can be used instead of RET and IRET can immidiately follow
VCALL. VCALL is used to call frequently used routines and takes 1 word.
See Also RET, IRET, CALL, Ccc
Example 4.14.84.1 VCALL 0x7F02
Loads PC value with the program memory address stored in program memory location 0x7F02.