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Individual Instruction Descriptions
4-180
4.14.83 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, C
cc
Example 4.14.83.1 VCALL 0x7F02
Loads PC value with the program memory address stored in program memory location 0x7F02.